EP1329286B1 - Grinding of clothing - Google Patents

Description

The invention relates to the grinding (or "sharpening") of trimmings, in particular, but not exclusively, of sets of covers of a revolving flat card. The invention is suitable for the installation of a grinder (sharpening device) in the card, but is not limited thereto, could therefore be applied in a device that should be attached to a card as needed and carried from card to card. The invention is designed so that the device can be used while the card is running. However, this does not represent a limitation, the invention could be applied in a device that works only when stopped (non-producing) card.

The invention relates to a device for feeding a garnish-mounted garment set to a sharpening device with means for delivering the individual garniture carriers to the grinding device with a plurality of individual sanding elements (see for example WO 99/16579).

The trimmings are, in particular, but not exclusively, arranged on the covers of a revolving flat card. The invention is suitable for the installation of a grinder (sharpening device) in the card, but is not limited thereto, could therefore be applied in a device that should be attached to a card as needed and carried from card to card. The invention is designed so that the device can be used while the card is running. However, this does not represent a limitation, the invention could be applied in a device that works only when stopped (non-producing) card

State of the art:

A prior application, EP-A-800 895, describes a sharpener or sharpener which can be used to grind blankets. Another earlier application PCT / IB98 / 01471 (WO99 / 16579) further develops the concepts according to EP-A-800 895. WO99 / 16579 & EP1019218A is state of the art according to Art. 54 (3) EPC.

According to EP-A-800 895, a grinder comprises a plurality of individual grinding elements which can penetrate between the tips of the clothing to be ground, sweep over the heads of the tips and thereby grind them. The grinding elements are preferably elastically bendable.

The grinding elements can be arranged so that they are distributed in operation over the working width of the card. For this purpose, they may be carried by an elongate carrier, e.g. such that each abrasive element is secured at one end to the carrier and protrudes from its point of attachment transverse to the carrier. The carrier may be mounted in use on the carding frame by means of a holder in approximately predetermined relationship to the traveling lid assembly, e.g. such that the covers are ground during the "return".

The abrasive elements, the carrier and the support may together constitute a device incorporated in the card, e.g. such that the device is put into operation with the card itself. For this purpose, the carding machine can comprise a drive or a control for the grinding device. However, the device can be designed so that it can be mounted on the card, it could e.g. own drive or own control include.

According to a first aspect of the invention according to WO99 / 16579, a card top grinding machine is further characterized in that it is provided with a means for removing released abrasive particles (preferably with a suction). According to a second aspect of the invention according to WO99 / 16579, a grinding device according to EP-A-800 895 is further characterized in that it is arranged opposite a clothing carrier (eg a traveling lid unit) in such a way that a substantially predetermined immersion depth of the grinding elements in the Garnitur results. According to a third aspect of the invention according to WO99 / 16579, a grinding device according to EP-A-800 895 is further characterized in that it is used not discontinuously but controlled discontinuously (intermittently), wherein the total (less than 1%) expected lifetime of the card can be less than 5%.
According to a fourth aspect of the invention according to WO99 / 16579 a grinder for a clothing is provided, comprising elastically bendable elements, which elements can paint over the front sides of Gamiturelementen and thereby grind or sharpen. This aspect has been specifically designed in WO99 / 16579 for sharpening sawtooth assemblies.

A disadvantage of the prior art is that the way of delivery of the sander must be set to the trimmings. If abrasives or clothings wear, the feed path must be checked and, if necessary, readjusted for each new grinding operation. This is a complex process that can also be faulty.

The present invention:

The disadvantages of the state of the art are solved by the features of claim 1. The device for feeding a set of clothing elements arranged on a clothing carrier to a sharpening or grinding device with a plurality of individual grinding elements is designed such that a means is provided which brings a force between clothing and grinding device to effect, so that the clothing and the grinding device are pressed against each other and causes a predetermined immersion depth of the clothing elements in the grinding device. It can thereby ensure a uniform pressing of the clothing to the grinding device. This establishes a state of equilibrium between the clothing and the grinding device which, depending on the selected force, causes the predetermined immersion depth of the clothing elements. There is thus a pressing of the clothing to the grinding elements, whereby a targeted grinding of Garniturefemente is made possible. With the present inventive device, a particularly dimensionally accurate and dimensionally accurate grinding of the clothing elements is made possible. By an interaction of the feed device with the sharpening or grinding device, a particularly advantageous device for grinding and sharpening is provided. The sharpening or grinding device described above can be used both with and without the feed device according to the invention. However, a particularly advantageous embodiment of the invention is achieved by the combination of the two devices.
It has been found that the force to be applied to the clothing depends on the resistance of the grinding elements of the grinding device. The greater the resistance of the grinding elements, the greater the force with which the clothing must be pressed against the grinding device, if the same Zustellweg is to be achieved. In order to bring about different deliveries of the clothing elements to or into the sanding elements, it is advantageous if the force with which the clothing is pressed in the direction of the sanding device is adjustable. As a result, the penetration depth of the clothing in the grinding elements is changeable and the removal during grinding adjustable.

Advantageously, the force is adjusted at different Schleefemenfien so that the clothing elements with the shorter grinding elements just contact. This ensures that substantially all the grinding elements are in engagement with the clothing elements and thus optimum success in grinding can be achieved.

Particularly advantageous for the success of the grinding, as well as for an economical construction of the device has been found that the force acts on the clothing carrier and the Garnitureinrichtung via support surfaces for the clothing carrier, which is arranged during the grinding process on the support surfaces. This creates surfaces which interact with mating surfaces on the clothing carrier and thus ensure exact positioning of clothing carrier or clothing elements to the grinding device. The force is definable on the clothing carrier introduced.

The force can be applied to the clothing via springs or fluid cylinders. These may be coil springs, leaf springs or rubber springs. As a fluid cylinder in particular pneumatic or hydraulic cylinders can be used. However, the force can be generated by the weight of the device, possibly in combination with a counterweight.
Advantageously, the support surfaces are designed to be movable in the direction of the grinding device. As a result, the support surfaces are brought together with the clothing if necessary in contact with the grinding device. Due to the movable training a deflection of the clothing in relation to the grinding device in case of excessive force is possible, so that the clothing and the grinding device are always in equilibrium of forces. In contrast to the prior art, in which only a Wegzustellung done here is a leveling and even exposure of the grinding device on the clothing elements of the case.

If the clothing elements are not ground, it is advantageous that the support surfaces can be brought out of engagement with the clothing carrier. As a result, the traveling lid is guided past the grinding device, in particular in the case of a traveling lid unit, without being pressed by the supporting surfaces in the direction of the grinding device. By the out and engaging the support surfaces with the clothing carrier thus also the intermittent delivery of the clothing to the grinding device can be realized particularly advantageous.

In particular with moving sets, i. in the case of traveling lid units, to facilitate the emergence of the clothing carrier on the supporting surfaces, it is advantageous if ramps are provided on the supporting surfaces. The clothing carriers are thereby gradually brought to the desired distance and force with the grinder.

It is advantageous if the grinding or sharpening device can be used as a maintenance device transportable for sets of different machines. In particular, by the relatively short-term use of the device, it is economical to provide a single device for several machines.

Fig. 1

eine Kopie der Figur 1 aus EP-A-787 841,

Fig. 2

eine erste Ausführung des Standes der Technik nach EP-A-800 895,

Fig. 3

eine schematische Darstellung eines einzelnen Drahtstückes, von vorne betrachtet, um die Schleifwirkung nach EP-A-800 895 zu veranschaulichen,

Fig. 4

eine schematische Darstellung des gleichen Drahtstückes von der Seite betrachtet,

Fig. 5

eine schematische Darstellung einer Variante der Ausführung nach Fig. 2, wobei Fig. 5A ein Detail dieser Ausführung zeigt,

Fig. 6

eine schematische Darstellung einer möglichen Anordnung der Schleifborsten an ihrem Träger,

Fig. 7

eine schematische Seitenansicht im Querschnitt eines bevorzugten Gerätes nach WO99/16579,

Fig. 8

ein Detail aus Fig. 7,

Fig. 9

ein Schema einer Deckelzustellvorrichtung des Gerätes nach Fig. 8,

Fig. 11A bis 11D

vier schematische Darstellungen von Endpartien der Garniturhäkchen,

Fig. 12

eine schematische Darstellung eines Arbeitsprinzipes zur Lösung eines aus den Figuren 11A bis 11D ersichtlichen Problems,

Fig. 13a, b

eine Modifikation des Gerätes nach Fig. 2,

Fig. 14 und Fig. 15

je eine Modifikation der Anordnung nach Fig. 13a, b

Fig. 16

eine erste Möglichkeit zum Erzeugen des erforderlichen Anpressdruckes,

Fig. 17

eine zweite Möglichkeit zum gleichen Zweck,

Fig. 18

das Eingreifen von Seiten- und Stirnschleifelementen in eine Garnitur,

Fig.19

einen Besatz einer Halbschale,

Fig. 20

die Anordnung der Schleifeinrichtung an einer Karde,

Fig. 21

eine skizzierte erfindungsgemässe Zustellvorrichtung

Fig. 22

einen Funktionsablauf der erfindungsgemässen Zustellvorrichtung.

Fig. 23

eine schematische Zusammenstellung der einzelnen Elemente eines Schleifgerätes mit einem Endteil eines Deckels,

Fig. 24

eine Ansicht zu einem grösserem Massstab eines Gleitklotzträgers zur Verwendung in einer Anordnung nach Fig. 23, und

Embodiments are explained in more detail below as examples with reference to FIGS. It shows:

Fig. 1

a copy of Figure 1 from EP-A-787 841,

Fig. 2

a first embodiment of the prior art according to EP-A-800 895,

Fig. 3

a schematic representation of a single piece of wire, viewed from the front to illustrate the grinding action of EP-A-800 895,

Fig. 4

a schematic representation of the same piece of wire viewed from the side,

Fig. 5

2 shows a schematic representation of a variant of the embodiment according to FIG. 2, FIG. 5A showing a detail of this embodiment,

Fig. 6

a schematic representation of a possible arrangement of the abrasive bristles on its support,

Fig. 7

a schematic side view in cross section of a preferred device according to WO99 / 16579,

Fig. 8

a detail of Fig. 7,

Fig. 9

a diagram of a lid delivery device of the device of FIG. 8,

Figs. 11A to 11D

four schematic representations of end parts of the clothing check mark,

Fig. 12

1 is a schematic representation of a working principle for solving a problem which can be seen in FIGS. 11A to 11D,

Fig. 13a, b

a modification of the device of FIG. 2,

FIGS. 14 and 15

each a modification of the arrangement of FIG. 13a, b

Fig. 16

a first possibility for generating the required contact pressure,

Fig. 17

a second possibility for the same purpose,

Fig. 18

the engagement of side and face grinding elements in a clothing,

Figure 19

a trimming of a half-shell,

Fig. 20

the arrangement of the grinding device on a card,

Fig. 21

a sketched delivery device according to the invention

Fig. 22

a functional sequence of the inventive delivery device.

Fig. 23

a schematic combination of the individual elements of a grinder with an end portion of a lid,

Fig. 24

a view to a larger scale of a Gleitklotzträgers for use in an arrangement according to Fig. 23, and

in Fig. 1 is a known Wanderdeckelkarde 1, for example, the card C50 of the Applicant, shown schematically. The fibrous material is fed into the hopper 2 in the form of dissolved and cleaned flakes, taken over by a breech or licker-in 3 as a cotton pad, transferred to a drum or drum 4 and disintegrated and cleaned by a traveling lid set. Fibers from the fibrous web located on the drum 4 are then removed by a pickup 7 and formed into a carding belt 9 in an outfeed section 8 consisting of different rollers. This card sliver 9 is then deposited by a reel 10 in a transport can 11. The card is provided with a "main suction", which waste can be removed. Such suction is not specifically shown in FIG. 1, but is well known to those skilled in the art. An example of such a suction is found in EP-A-340 458. The traveling lid set comprises revolving lid bars, which are not shown individually in FIG. 1, but indicated in FIG. 2 by reference numeral 13. Each bar 13 is provided with a garnish 14.

The covers 13 are attached to a chain or a belt 5 (eg according to EP-A-753 610) and they are thereby a closed "cover path" (via deflection rollers 6) along or in the same direction to the direction of rotation of the drum 4 is moved on a "Vorlauf" (from an inlet point E to a discharge point A) made the carding and cleaned on the "return" the lid at a cleaning station 60. The cleaning device has been explained in detail in EP-A-800 894. Subsequently, e.g. at the point 62, the lid 13 are ground according to EP-A-800 895.

Fig. 2 shows an embodiment according to EP-A-800 895, wherein in this embodiment the grinding point "coincides" with the cleaning point. This embodiment includes a "Brush" having a sleeve 59 (FIG. 2), abrasive members 42 and cleaning bristles 50 carried by the sleeve and extending away from the sleeve 59 in the radial direction. The sleeve 59 is preferably formed from two "half-shells", which sit in the installed state fed to a drive shaft 57. The brush is provided as part of the lid cleaning device 60. Fig. 2 also shows a flat bar 13 (including clothing 14). The direction of movement of the flat rod 13 and the direction of rotation of the sleeve 59 are indicated by arrows.

As usual when garnishing card covers, the clothing 14 is designed as a flexible or semirigid set, the individual clothing elements 40 of wire (flat wire or round wire), each with a so-called knee 41 are formed. The bristles 50 penetrate to the bottom of the clothing 14, i. to the surface of the rod 13, from which the wires 40 protrude to thoroughly clean the clothing. However, only half of the circumference of the sleeve 59 is occupied by bristles 50, the other half carries the abovementioned grinding elements 42.

The abrasive elements 42 in this embodiment are similar to the bristles 50 at least in that they are formed as elongate, elastically bendable elements which protrude approximately radially from the lateral surface of the sleeve 59. The abrasive elements 42 are also more flexible than the wires 40, so that in the case of contact such an element with a piece of wire during a relative movement of the element and the wire, the grinding element 42 must give way. However, the elements 42 are significantly shorter than the bristles 50, so that they only reach the "head parts" of the clothing wires 40 (above the respective knee 41). Nevertheless, the speed of the free end portion of each element 42 is greater than the speed of the clothing wires 40 in the direction of movement 15. As the abrasive elements 42 pass the clothing elements 40, they penetrate the clothing with their free end portions on both sides of the head portions of the wires be deflected (Fig. 3).

The head portion of each wire element is provided with a side cut, ie, the side surfaces 43 (Figures 3 and 4) converge outwardly in the radial direction to form an end edge 44. Each pass of the abrasive elements 42 to the Surfaces 43 is a polishing or grinding of the side surfaces 43 instead. The aggressiveness of the polishing or grinding action depends on the design of the grinding elements and the speed of the relative movement. The optimum effect for a given wire type can be determined empirically.

• Die Reinigungswirkung nimmt ab, weil die Hälfte der Reinigungsborsten 50 "fehlen" (weil sie durch Schleifelemente ersetzt wurden),
• es ist nicht möglich, durch die Einstellung der Drehzahl der Welle 57 (Fig. 2) sowohl die Reinigungs- wie auch die Schleifwirkung zu optimieren,
• es ist nicht möglich, das Schleifen allein "abzustellen", z.B. um ein periodisches Schleifen (nach einem gesteuerten "Stop/Go" Verfahren) zu ermöglichen. Ein solches Verfahren ist z.B. in EP-A-565 486 beschrieben worden.

The solution of Fig. 2 has certain advantages in the retrofitting of existing cards, which are equipped with a cleaning brush (only provided with bristles 50). The "infrastructure" (ie the support, in the form of a sleeve 59, its support, in the form of the shaft 57 and its mounting and the associated drive) already exists. But the lid cleaning is constantly in use (as long as the card is running), the cover wires are accordingly "constantly" ground and certain disadvantages must be accepted:

• The cleaning effect decreases because half of the cleaning bristles 50 are "missing" (because they have been replaced by abrasive elements),
• it is not possible, by adjusting the speed of the shaft 57 (FIG. 2), to optimize both the cleaning and the grinding action,
• it is not possible to "turn off" the grinding alone, for example, to allow a periodic grinding (after a controlled "stop / go" method). Such a process has been described, for example, in EP-A-565 486.

It has therefore proved to be advantageous to provide for grinding own infrastructure in the card, in particular a separate holder for the carrier (whereupon the grinding elements 42 are attached) and a separate controllable drive. As a result, a relative speed of the grinding elements to the wires of more than 15 m / sec (eg 20 m / sec) can be achieved. Such relative speed is not optimal for a cleaning brush. The grinding point is thereby separated from the cleaning point and is preferably viewed after the cleaning point in the direction of movement 15 (FIG. 2).

The variant according to FIG. 5 comprises a helical arrangement of grinding elements 42 along a cylindrical support. Each element is formed as a bristle 45 (see in particular the detail - FIG. 5A). The bristles 45 are shorter than the bristles 50 of the embodiment of FIG. 2, and at least the free end portion of each bristle 45 is provided with an abrasive to form a grinding region (abrasive article). The entire bristle may e.g. be interspersed with abrasive. The abrasive is e.g. hard particles 46 (abrasive grains, diamond grains or the like) fixed to the bristle 45 by adhesive or a binder or embedded in a matrix. The helical row of elements 42 extends over the entire length of the carrier and therefore over the entire working width. On the side of the sleeve 59 not visible in FIG. 5, a second row of grinding elements can be arranged in a mirror image to the first row.

The previous description assumed that the grinding device should be installed in the card, but the invention of EP-A-800 895 is not limited thereto. The card might e.g. merely have attachment points where a holder of the grinding device can be attached. The device itself could then be carried from card to card and mounted only when needed on a specific card and put into operation. Such a device could have its own drive to rotate the carrier carrying the grinding elements or could merely be coupled to allow temporary connection to the drive of the machine.

The preferred solution according to EP-A-800 895 included a grinding device with its own "infrastructure" (carrier, drive, etc.) and with grinding elements according to Fig. 5, wherein the carrier 59 is preferably "fully populated" (rather than merely with individual helical rows of Abrasive elements) was, that should be occupied virtually over the entire circumference with grinding elements.
For certain applications, it has proved undesirable to realize the brush as a "fully populated" carrier. Commercially available abrasive elements are available that appear too aggressive in a fully populated design. An alternative arrangement is therefore shown in Fig. 6 and consists of a zig-zag Row of bristle groups along each half shell. The individual bristles are shown in Fig. 5A - each consisting of a filamentous nylon substrate interspersed with silicon carbide. With the gradual abrasion of the bristle new Schleifpartikein exposed. From the number of "bristle lines" L results in the number of clothing tips that are ground simultaneously. This can be selected depending on the output power of the drive.

• eine Absaugung, um abgeschliffene Partikel zu entfernen und
• eine Deckelzustellungsvorrichtung, welche die Deckelstäbe einer nach dem anderen zum Schleifen der jeweiligen Garnitur durch Anheben aus dem Deckelpfad in eine Schleifstelle der Bürste zustellen kann.

FIG. 7 shows two further modifications of the arrangement according to EP-A-800 895, namely:

• a suction to remove abraded particles and
• a lidding device which can deliver the flat bars one by one for grinding the respective set by lifting from the lid path into a grinding position of the brush.

• ein Gehäuse 20, das zur Montage am Kardengestell an einer vorbestimmten Position ausserhalb des Deckelpfades und (stromabwärts von) in Deckellaufrichtung nach der Reinigungsstelle 60 (Fig. 1) vorgesehen ist,
• die Bürste mit dem Träger 59 (vorzugsweise aus Halbschalen gebildet), Schleifborsten 42 und einer entsprechenden Lagerung bzw. Halterung (nicht gezeigt) im Gehäuse 20,
• ein steuerbarer Bürstenantrieb 22 (Fig. 9), der am Gehäuse 20 befestigt und mittels einer Kupplung 21 mit der Welle 57 verbunden ist,
• ein Luftabsaugkanal 23, der sich über die Arbeitsbreite der Garnitur 14 erstreckt und an einem Ende mittels einer Koppelung 24 mit der Hauptabsaugung 25 der Karde verbunden werden kann,
• eine pneumatisch betätigbare Hubvorrichtung 26 (Fig. 9), welche auf der Innenseite des Deckelpfades angeordnet und dem Gehäuse 20 des Schleifgerätes gegenüber steht.

The sharpening or grinding device according to FIG. 7 therefore comprises the following elements:

• a housing 20 which is provided for mounting on the card frame at a predetermined position outside the cover path and (downstream of) in the cover running direction after the cleaning point 60 (FIG. 1),
• the brush with the carrier 59 (preferably formed from half-shells), abrasive bristles 42 and a corresponding support or holder (not shown) in the housing 20,
• a controllable brush drive 22 (Figure 9), which is attached to the housing 20 and connected by a coupling 21 with the shaft 57,
• an air suction duct 23 which extends over the working width of the clothing 14 and can be connected at one end by means of a coupling 24 with the main exhaust 25 of the card,
• a pneumatically actuated lifting device 26 (FIG. 9) which is arranged on the inside of the cover path and faces the housing 20 of the grinding device.

The lifting device 26 comprises two lifting elements 28, which are arranged in the vicinity of each card side shield (not shown). These elements are vertically movable up and down between a lower standby or rest position and a working position by a respective pneumatic cylinder 29 and lever 30. Each lever element 28 is provided with a ramp 31 and a horizontal support surface 32.
The card itself comprises a compressed air supply 27 for the lifting device 26 and a control (not shown) for the brush drive 22.

The grinding device according to FIGS. 7 to 9 works as follows:

After the card is put into operation with a new flat fitting, the sander does not work, i. neither the brush nor the lifting device are powered by the card. The covers 13 accordingly travel along their "normal path" without coming into contact with the lifting elements 28 of the lifting device 26, since these elements are currently resting in their lower (standby) positions. The position of the housing 20 is selected in such a way with respect to the normal cover path that also no contact takes place between the abrasive bristles 42 and the clothing tips. By means of a flap (not shown), the air suction channel 23 is separated from the main suction 25 of the card, so that no air flow is generated in the suction channel 23 through the housing 20.

At a suitable time (which will be explained in more detail below), the grinding device (including lifting device and suction) is put into operation. For this purpose, the brush is rotated in the direction of the arrow (FIG. 7), the air suction channel 23 is connected to the main suction 25 of the card and the pneumatic cylinders 29 are actuated so that the lifting elements 28 are raised to their working positions. As shown schematically in Fig. 7, the lid 13 can not be attached to the Lifting elements 28 pass without touching the ramps 31. As the lids 13 are pulled forward by the chains or belts 5, they must first ramp up the ramps 31 one at a time, then move across the support surface 32 parallel to the normal path, and then return to the normal path. When the lifting members 28 are in their raised (working) positions, the support surface 32 defines a "grinding point" wherein the wire tips of the clothing 14 lie within the cylindrical surface of the abrasive bristles 42. The stroke of the lifting movement is selected so that the abrasive bristles 42 (while a lid 13 of the brush is delivered by the lifting device 26) penetrate into the clothing up to a predetermined "immersion depth" ET (FIG. 8) and the clothing tips (as in the earlier FIG Invention) grinds. For a semi-rigid or flexible clothing, it has been found advisable to provide a maximum immersion depth ET of about 2 mm (measured from the clothing tip, see Fig. 8), which parameter can be optimized depending on the type of clothing and especially for a All steel set can be chosen differently.

The lifting device 26 remains in this working state until each cover 13 has been "x-times" ground, where "x" any rational number, preferably in. Range 1 to 5, is. The lifting elements 28 are then lowered again.

The lifting elements 28 can press the cover 13 against a stop surface 70 of a stop element 71 at each end of the cover 13. The stop surface 70 is at a predetermined distance from the grinding elements 42. By these stop surfaces, the penetration depth of the grinding elements 42 is set in the clothing 14. Since the clothing height decreases with each grinding operation, but the penetration depth for optimal grinding requires a certain depth, it is advisable to make the stop surface 70 with respect to the grinding elements 42 adjustable. In the case of a clothing 14 which has already been sanded more often, the distance from the abutment surface 70 to the sanding elements 42 is smaller than with new clothing 14. However, the lifting elements 28 only press the covers 13 firmly against the abutment surface 70 in such a way that a clamping action is produced , which is so small that a further movement of the lid 13 can be carried over the lifting elements 28 away.

Grinding can be done without turning off the card. However, it is advantageous that the sander operates on cleaned lids 13, i. The grinder is followed by the lid cleaning. However, it has also proved to be advantageous to remove the particles released by the grinding from the cover area, since they may otherwise be reduced on the running surfaces of the cover 13 (on the "sliding arc" of the card, not shown). The removal of the waste material is accomplished by an air flow L, which is generated by a negative pressure in the air suction channel 23 and preferably flows through from one side to the other of the lid grinding point. For this purpose, the housing 20 is provided with a suitable air supply opening 33. From the air suction duct 23, a screen wall 34 extends practically as far as possible to the cover grinding point or as close as possible, without risking a scraping contact of the abrasive bristles with the freestanding edge 35 of the screen wall 34.

After the clothing tips have been ground, the device is again turned off by the power supply to the lifting device 26 and the brush drive 22 is suppressed and the suction channel 23 by the flap (not shown) separated from the main exhaust 25 again. Accordingly, the covers 13 only move along the normal lid path and they are no longer delivered to the grinding brush. After an operating interval without grinding the covers, the sander can be restarted to maintain the quality of carding work in the main carding zone at a desired level.

After some grinding cycles have been completed, the abrasive bristles 42 will be shortened by wear from their original lengths. Although the bristles 42 themselves are still operational, the required minimum immersion depth ET (with unchanged cover delivery) will no longer be achievable. This problem could be solved in principle by the fact that the housing 20 is adjustable relative to the card frame. In an alternative, the feed motion is changed to compensate for the shortening of the bristles 42. This can be accomplished by providing a stop (not shown) to hold the (raised) To determine positions of the lifting elements 28 when delivering the cover 13, wherein the position of the stop of the brush is variable relative to. The pneumatic lifting device 26 must be designed so that it can lift the lifting elements 28 up to a predetermined "limit position" of the stop. When this position is reached, the shortening of the abrasive bristles 42 has progressed so that they should be replaced rather than reused.

The previous description assumes again that the device is installed in the card. The grinder could be designed as a maintenance device that is attached to a particular card during grinding but then transferred to another card. Even such a device should be provided with a suction, which, however, can not necessarily be coupled to the main suction of the card, because card types are very different and the device should be as "universal" use. However, a "portable" device could be connected to its own vacuum source, which removes the sanding dust.

A portable device could include a lid delivery device. However, this is not absolutely necessary for such a device. Firstly, it is the common practice of card manufacturers to provide and even install cap lifters to enable grinding of the caps with a conventional abrasive roller, and secondly, in growing a portable device, it is possible to determine the depth of immersion by adjusting the device holder, i. without having to deliver the covers at all to the brush. It will also be understood that a portable device is more suitable for manual operation, although timers or deck counters could be readily used to control a grinding cycle.

A portable device could be designed for use with the card still running, but will normally be used on non-card makers. In the latter case, it is not absolutely necessary to have the grinder in a specific position Relate to the lid cleaning, since the lid during a "service" in any case, regardless of the cleaning device of the card be cleaned.

The maximum immersion depth ET of about 2 mm may be e.g. be reduced to about 1 mm before the feed movement is changed, preferably not falling below an immersion depth of 1.5 mm. The change in the feed movement (i.e., in the example given, the change in the position of the adjustable stop) is preferably also controlled, and in principle can be carried out manually.

The grinding or sharpening process can be performed without coolant (dry sharpening) for flexible, semi-rigid and all-steel flat fittings.

The sharpening bristle length can be 15 to 20 mm when used for the first time. The grain size of the bristle may be between about 300 and 600, e.g. 500. The flap (not shown) which separates the air suction channel 27 from the main suction can be actuated by the lid delivery actuator (the lifting device 26).

Suitable shielding for the treads (the slip arc) of the lids may be provided to prevent settling of grinding dust thereon. Such cover sheets are not shown here, as suitable elements for use with conventional sanding rollers are known and can be adopted for use in combination with the new device.

The aggressiveness of the grinding elements or of the grinding device must at most be increased for processing an all-steel clothing, which brings the "fully stocked" carrier back in the foreground. Since the "side grinding" is irrelevant to the all-steel clothing, the elements can be changed so that they mainly act on the (radially outwardly) end faces of the clothing teeth. For this purpose, the elasticity or the design (eg the width) of the grinding elements can be changed such that they have less tendency to penetrate between the clothing elements, but more the ability to bend in the direction of movement of the clothing elements. Instead of abrasive bristles you could For example, select slats that "support" on the front sides of the fitting teeth. Such a sander could also be used to grind reel, licker-on, or pick-up sets. Accordingly, a grinding device can be provided, which is provided with elastically bendable grinding elements, these elements can cover the front sides of clothing elements and thereby grind or sharpen.

The check marks in FIGS. 11A and 11B are new and each have a free end section 70. Each has two side surfaces 72 made by the side grinding which together form a straight edge 73 which gives a "sharp tip" 74 "forwardly".

The check marks of FIGS. 11C and 11D are worn and ground by a device according to EP-A-800 895. They have end portions 75 which differ significantly from the end portions 70. Although the grinder has created new side surfaces 76, which result in an end edge 77. In side view (Figure 11C), this edge 77 is not straight but curved and viewed from the front (Figure 11D) it is slender but more rounded than pointed. In any case, a tip 74 is missing (Figure 11A). It is necessary to arrive as possible to the shape of the end parts of Fig. 11a and 11B again.

A solution is shown schematically in FIG. A rotatable support 80 is equipped with abrasive bristles 82 which strip at the free ends of the hook 84 of a flat bar 86. The direction of rotation of the carrier 80 and the direction of movement of the rod 86 are indicated by arrows. When the bristles 82 are now brought into contact with the ends of the prongs without substantially penetrating them, they eliminate the curvature of the edge 77 (Figure 11C) and reestablish a straight edge. For this purpose, a certain contact pressure is required, wherein the bristles 82 must be selected such that they do not penetrate under this pressure between the hooks, but edit the "front sides" of the hook.

The abrasive bristles 82 are therefore preferably different from the abrasive members 42 of Figure 2 in that they are shorter, stiffer, thicker, or more densely populated, for example, causing more bristles to be in contact with the same Are clothing. For these or other reasons, they have a lower elasticity than the elements 42. The carrier 80 is also preferably so densely covered with bristles 82 that the resulting "brush" creates some resistance to the penetration of the individual bristles into the clothing, which is why the end faces rather than the side surfaces of the prongs are machined.

One practical solution could therefore include two different brushes, one of which (according to EP-A-800 849) creates the side grinding and the other a sharp point. However, the preferred solution includes only a single "brush", which is equipped with two different bristle types.

A first embodiment can therefore be derived directly from the variant according to FIG. 2 by using two different half-shells, each with its own bristle type. Such an embodiment is shown in Fig. 13a, b. Since the abrasive brush does not have to perform a cleaning function, the bristles 50 (Fig. 2) are missing, which are at the bottom of the flat rod assembly. The one half shell has abrasive bristles 42 which (as in the variant according to FIG. 2) process the side surfaces of the hook end parts. The other half shell has additional abrasive bristles 82 which (as in the variant according to FIG. 12) process the end faces of the end part. In Fig. 13b four shells 59A, 59B, 59C and 59D are provided, which are arranged on a support 57. The abrasive bristles 42 and 82 are therefore arranged alternately on a quarter circle. This makes it possible to replace only the long bristles or only the short bristles.

Further variants are shown schematically in the figures given below, wherein in these variants each half shell comprises both grinding elements for ensuring the side grinding as well as elements for processing the end faces of the hooks:

Fig. 14 shows rows of relatively long side grinding members 42 and rows of relatively short members 82 for machining the end faces. The elements 42 and 82 are alternately inserted in each half shell (not shown). The carrier roller is indicated by 204.

In Fig. 15, each bristle row is equipped with both long side grinding elements 42 and short end-side processing elements 82. On the support roller (not shown) may be arranged more of these rows of bristles. For better assembly, they are arranged on half shells 205 and 206, which are screwed at regular intervals on the drum or roller, not shown.

Figures 16 and 17 each show a way to generate the required contact pressure when sharpening the clothing. In the variant according to FIG. 16, a flat bar 90 is delivered by means of a feed plate 92 of the grinding brush. The brush is here indicated schematically only by the bristles 82, 42, wherein the direction of rotation is indicated by an arrow. The plate 92 is urged by a spring 96 in the direction of the axis of rotation (not shown) of the brush, wherein the feed movement is limited by the contact of the hook end with the relatively stiff bristles 82. If the difference in length between the shorter and the longer bristles is about 1 to 4 mm (preferably 1.5 to 2.5 mm), the longer bristles 42 correspondingly press into the clothing 14 and ensure the side grinding.

The stiffer bristles 82 may be abraded by means of a dressing device prior to installation in the carding machine so that the brush runs in the working position across the machine parallel to the flat bar geometry.

In the variant according to FIG. 17, the flat bar 98 with its clothing 14 is "firmly" positioned, ie, it is not forced against the schematically indicated sharpening brush 100. Instead, the sharpening brush 100 is pressed against the flat bar 98, eg, by being rotatably mounted on a lever 102, the lever 102 being pivotally mounted on an axle 101. The pressure exerted by the brush 100 on the rod 98 contact pressure is adjustable because an adjustable in the longitudinal direction of the lever 102 counterweight 104 is provided.

With the counterweight 104, the force with which the brush 100 and the clothing are pressed against each other is set.

FIG. 18 shows the engagement of the flank grinding elements 201 and the face grinding elements 202 with respect to the clothing elements 210. It can be seen from this that the face grinding elements 202 are shorter than the flank grinding elements 201. As a result, the longer flank grinding elements 201 essentially only contact the side surfaces of the clothing elements 210 and grind them. The shorter end grinding elements 202 extend only to the tip or end of the clothing elements 210. As a result, they only pass along the end face of the clothing elements 210, so that only the end face is processed by the face grinding elements 202.

According to FIG. 19, an example of an arrangement of grinding elements 201 and 202 on a half-shell 205 'is shown. In contrast to the exemplary embodiments according to FIGS. 13A and 13B, a different occupation with grinding elements 201 and 202 is shown here on a half-shell 205. The half shell 205 'is divided into individual segments. Flank grinding elements 201 and face grinding elements 202 are arranged in adjacent segments. As a result, during a rotation, each clothing element 210 is swept by both flank grinding elements 201 and face grinding elements 202. To compensate for the axial forces acting on the roller 204, not shown, it is provided that the flank grinding elements 201 are arranged in opposite directions. As a result, the axial forces, which may occur due to the oblique arrangement of the flank grinding elements 201, cancel each other out.

The flank grinding elements 201 are arranged in substantially smaller numbers on the half-shell 205 'than the stim-grinding elements 202. In this way, a relatively strong resistance by the face-grinding elements 202 is also opposed to the clothing elements 210, so that the immersion depth is determined essentially by the height of the face-grinding elements 202 ,

The segments comprising end grinding elements 202 may overlap each other in the circumferential direction of the brush. This avoids that "lanes" between these segments remain open, which would result in unpolished needles (in the lanes).
Each group of flank grinding elements 201 may consist of two parallel rows of such elements. The "front" row (viewed in the direction of rotation) of each group is first worn, with the bristles of this front row supported by the bristles of the back row. If the bristles of the front row are shortened by the wear, the bristles of the rear row are used.

FIG. 20 shows the arrangement of the sharpening and grinding device on a carding machine 1 with a traveling lid unit. In this exemplary embodiment, the roller 204 is arranged in the running direction of the flat bars 13 following the cover cleaning device 60. At this point, a very good arrangement of the grinding device has proven from the available space as well as the operability. The arrangement corresponds essentially to the arrangement according to FIG. 1, which designates the grinding point 62 likewise following the cleaning point 60. The direction of rotation of the roller 204 (or the brush) is opposite to the direction of rotation of the drum 4.

Figure 21 shows a schematic diagram of an inventive delivery device. In this case, the flat bars 13, each with a set 14, are shown, which are connected to one another via connecting elements (not shown), for example chains or belts. In this case, a cover 13 is fed to a feed device 220. In this case, the cover 13 is moved onto a slide block 224, which moves the flat bar 13 in the direction of a roller 204. The roller 204 rotates in the arrow direction at a peripheral speed, which allows a sufficient cutting speed for grinding the clothing 14. The flat bar 13 is thereby pressed by means of spring force, which results from the springs 223, against grinding elements which are arranged on the roller 204. The abrasive elements are shown in FIG. 21 only by means of the respective "lateral surfaces" 202A (for the shorter, more rigid Elements for grinding the front edges) and 201A (for the longer, more flexible elements for creating the side cut). The grinding elements 201 and 202 bring the flat bar 13 a corresponding force, so that an equilibrium state between the roller 204 and the flat bar 13 sets. By this state of equilibrium, a predetermined penetration depth of the clothing 14 into the grinding elements 201 is to be effected.

If the grinder is not to press on the clothing 14, the feed device 220 is moved away from the roller 204 in the double arrow direction. As a result, the flat bars 13 slide past the slide block 224 and are not raised in the direction of the roller 204. This is, so to speak, an on / off device for the grinding device.

FIG. 22 shows in the sketches a) to e) various situations in the area of the grinding roller 204.

In a) a Gamiturträger 213 is sketched with a set 200. The clothing carrier 213 is in this case a flat bar. The clothing 200 consists of a plurality of clothing elements 210. These may be hooks or teeth in other embodiments. The clothing carrier 213 slides on a guide 215.

In b), the feed device 220 is shown when it is in the standstill position, and the roller 204 with the lateral surfaces 201, 202 (similar to Fig. 21). By the distance of the guide 215 from a grinding roller 204, the Gamiturträger 213, when it slides on the guide 215 under the roller 204, no contact with the roller 204 and the grinding elements 201 and 202. The feed device 220 consists in this outlined embodiment a sliding element 222, which can be moved in guides 227 in the direction of the roller 204. On the sliding element 222 springs 223 are arranged. On the springs 223, a slide block 224 is attached. In the illustrated position of the feed device, the springs 223 are in the pretensioned position. Characterized in that the sliding element 222 is in the lowest position, the slide block 224 has no contact with the clothing carrier 213 moving over it.

in illustration c) it is shown how the clothing carrier 213 is located on a support surface 226 of the slide block 224. The clothing carrier 213 has been previously moved over ramps 225 onto the support surface 226. The position c) shows the compression of the springs 223 by the load with the clothing carrier 213. It is here on the counterforce, which is applied in the application by the roller 204 is omitted for purposes of illustration. The sliding element 222 is in the position c) in the extended position. This means that the guides 227 are here in maximum delivery position.

In contrast to the position c), the actual state of the position of the clothing carrier 213 with the roller 204 arranged is shown at the position d). It can be seen here that the grinding elements 201 and 202 press against the clothing 200 or the clothing elements 210. It is thus the spring force of the springs 223 a force from outside through the grinding elements 201 and 202 presented. The delivery device is thus in the state of equilibrium, so that on the one hand counteracts the force of the springs 223 against the force corresponding to the contact pressure of the grinding elements 201 and 202, in particular the grinding elements 202. In essence, the shorter and stiffer end grinding elements 202 provide resistance to the spring force.

The system has the significant advantage that by the spring force and the resistance of the grinding elements 201 and 202, a self-adjustment of the device takes place. While the sliding element 222 only needs to be conveyed from one stop position to the other stop position, the spring force ensures that the garment elements 210 are pressed against the grinding elements 201, 202 and always uniformly. By a different bias of the springs 223 different forces can be set here, whereby the immersion depth of the clothing elements 210 can be predetermined in the grinding elements 201 and 202.

In position e), the ground clothing carrier 213 is again arranged outside the engagement of the roller 204 and outside the engagement of the feed device 220 on the guide 215 after passing through the grinding device.

Fig. 24 shows a carrier part 230 of a feed device with the slide block 224 and springs 223, of which a spring is indicated only by a dashed line 223A. The support member 230 has a respective receiving bore for each spring 223. 231, wherein a sliding member 224 connected to the guide member 232 is also received in this bore 231. When a cover slide member (partially indicated by 233) rests on the slide block 224, the guide members 232 are pressed in their respective bores 231 against the spring force. The distance "x" between the slide block 224 and the support member 230 may be adjustable to select the spring force.

In its standby position, the slide block 224 is located in the vicinity of a guide element 234 which is fixedly mounted in the frame (not shown) of the grinding device and received in a blind hole 235 in the support part 230, this element 234 on the sides? of the hole 235 slides when the support member 230 is shifted upward.
The support member 230 is pivotally mounted on a stub axle 236 of an eccentric shaft (not shown). When rotating the eccentric shaft, this axis 236 is rotatable vertically in the indicated arrow directions, the element 234 prevents a rotational movement of the part 230. The carrier part 230 can thereby be brought into contact with a stop 237. Such carrier parts must, of course, be provided on both sides of the drum 4 (FIG. 20). Each actuator (in this example, eccentric shaft and support member 230) is preferably adjustable to ensure that the relative movements of the support members 230 on both sides of the card are substantially the same. (ie the movements from the respective standby to the respective working positions).

Of course, the present invention is not limited to the illustrated embodiments. So, of course, another type of delivery device is possible. Instead of longitudinal guides, as they were carried out in Figure 22, for example eccentric guides are possible. In addition, the delivery of the roller 204 against a stationary support of the clothing carrier 213 is possible, in which the roller 204 is elastically mounted in an analogous manner, as in the embodiment of Figure 22, the feed device. This would be a kind of combination of the embodiment according to FIG. 22 with the embodiment according to FIG. 17. The trimming of the grinding device may include cleaning brushes as shown in FIG. It can thereby be done in addition to the grinding process at the same time a cleaning of the clothing. Furthermore, all illustrated embodiments are to be combined with each other and with the previously described in detail solutions of the prior art.

Fig. 23 schematically shows an assembly of a grinding apparatus SV with (only) one end portion of a lid D, wherein the center portion of the grinding apparatus SV has been cut out. The grinding device SV comprises a roller 204, a drive motor 239 and half shells (not specifically indicated) provided with long bristles 201 and short bristles 202 (see Figures 18 to 22). The lid D comprises a flat bar 13 with a garnish 14. The bar 13 is connected at one end by means of an end cap 235 with a belt 236. Compounds suitable for this purpose are shown, for example, in GB-B-870 424, DE-Gbm-7345579 and EP-A-627507. The other end of the flat bar 13 is connected in the same way with a second belt, which is why only one end has to be shown and described. The end head 235 is also provided with a sliding portion 237 which normally slides on a so-called return rail 238 as the lid approaches the grinder, or after the lid of the grinder has left. After actuation of the feed device Fig. 21, the end head 237 of a flat rod in the grinding position is no longer in contact with the associated Rücfaufaufschiene. Instead, an outer portion 233 (Figure 24) of the end head slides on the slide block associated with that rod end. (or sliding plate) 224.

The grinding device is mounted between two side walls 240 which have been firmly attached to the card frame. Adjusting means (not shown) are provided to assure that the axis of the roller 204 is parallel to the longitudinal axis of the flat bar 13 when the flat bar 13 is resting on the return rails. After the operation of the grinding or feeding device, the longitudinal axis of the raised flat bar should now still be parallel to the longitudinal axis of the roller 204. The delivery device in FIG. 23 comprises a carrier part 230 (see FIG. 24) which cooperates with a guide element 234 and a stub axle 236 (see FIG. 24) of an eccentric shaft 237. The shaft 237 itself is rotatably mounted in a wall-mounted bearing 241. Outside the side walls 240 are a rocker arm and a pneumatic cylinder for rotating the eccentric shaft 237. The latter elements have been omitted for the sake of clarity in FIG. 24. The card control triggers the actuation of the pneumatic cylinder to actuate the feed device.

Claims (6)

1. A feeding device for feeding a clothing comprising clothing elements (84) of a card disposed on a clothing support to a sharpening or grinding device, provided with means for feeding the individual clothing supports to the grinding device (204) comprising a plurality of individual grinding elements, wherein means (220, 102, 104) are provided which bring a force to act between the clothing (14, 200) and the individual grinding elements (201, 202) of the grinding device (204) so that the clothing (14, 200) and the grinding elements are pressed towards one another and a predefined insertion depth of the clothing elements in the grinding device is effected so that the clothing and the grinding device are always in force equilibrium.
2. The feeding device according to claim 1, wherein the force is adjustable.
3. The feeding device according to claim 1 or 2, wherein the force to be applied to the clothing can be adjusted depending on the resisting force of the grinding elements.
4. The feeding device according to any one of claims 1 to 3, wherein the means for feeding include supporting surfaces for the clothing support and the means to produce the force are allocated to these supporting surfaces.
5. The feeding device according to any one of claims 1 to 4, wherein the force is applied to the clothing via springs (223) or fluid cylinders.
6. The feeding device according to any one of claims 1 to 5, wherein the supporting surfaces (226) have ramps (225).

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