Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
  • D01H5/02—Gill boxes or other drafting machines employing fallers or like pinned bars
  • D01H5/08—Gill boxes or other drafting machines employing fallers or like pinned bars with bars connected by links, chains, or the like
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H13/00—Other common constructional features, details or accessories
  • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
  • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
  • D01H5/60—Arrangements maintaining drafting elements free of fibre accumulations
  • D01H5/64—Rollers or aprons with cleaning surfaces

Definitions

• the present invention relates to the field of textile machines, in particular chain gills and more particularly the caterpillars of the drawing heads and relates to a new safety and cleaning device for the bars of a crawler of a drawing head.
• chain gills horizontal or vertical, are composed of at least one drawing head constituted by two tracks located one opposite the other, one above the other or the one in front of the other, and placed between a pair of food cylinders and a set of stretching cylinders.
• the textile material passes successively between the food cylinders, then between the tracks and, then, between the stretching cylinders.
• Each track comprises a set of bars equipped with intersecting needles and arranged in such a way that, in the working area located between the food rolls and the stretching rollers, the textile material is moved, checked and retained by said needles before d '' be caught by the stretching cylinders. Near the stretching cylinders, the bars release the textile material away from the work area. Thus, in the working area, the bars are moved in the direction of movement of the textile material, that is to say from the food rolls to the stretching rolls.
• the inclination of the bar in its movement to extract the working area, is such that the needles leave the textile material without entraining it.
• This inclination of the bar is obtained by means of the bent shape of one end of the body of the bar, which cooperates with a cam track of a particular shape.
• the bars are integral with two endless elements, such as triple chains each placed near the ends of the bar bodies.
• the setting in motion of each triple chain is ensured by a set of three juxtaposed sprockets, the teeth of which mesh with the rollers of the links of the three chains constituting each triple chain.
• Each triple chain is tensioned by means of a tensioning pinion and is guided along its trajectory defining the work area, by chain guides, on which the rollers of the chain links can roll freely.
• the bars After leaving the work area, the bars move away from it, following an almost straight path perpendicular to the trajectory of the textile material. During this distance, the bars are inclined so that the bodies of the bars are almost contiguous and the needles of two consecutive bars are almost parallel to each other. Thus, it becomes possible to minimize the distance between the needle rollers and the working area. This distance, which must be as small as possible, directly conditions the control capacity of the shortest fibers.
• the bars are cleaned, on the one hand, using a fixed brush placed on the distance path of each of the tracks and, on the other hand, by a cylindrical brush located along the return path. Indeed, by continuing their movement, the bars are brought back in the opposite direction to the movement of the textile material. During this course, the inclination of the bars has no functional importance, nor, moreover, the shape of the trajectory of the bars. Also, along this return path, the tensioning sprockets are placed, the function of which is to exert constant tension on the chains and to compensate for their elongation due to the wear of the elements which make up the chains.
• a cylindrical brush is also placed along this return path, the axis of rotation of which is fixed relative to the drawing head and which is positively driven in rotation.
• the role of this brush is to perfect the cleaning of the bars and to detect windings of textile material around the track by means of sensors.
• the fibers and other impurities that the cylindrical brush removes from the bars are partly vacuumed using pneumatic sensors.
• Known strip cleaning devices which generally include two cleaning means, have the drawback of creating a large accumulation of fibers and impurities at the level of the fixed brush of the track.
• EP-A-66 437 also discloses a cleaning brush situated at the corner, that is to say at the end of the vertical part of the path of the bars, and whose position is not modifiable in the event of textile material being wrapped around a track.
• This brush is not a safety device and, thus, in the event of winding, the brush is also expelled from its support by the moving bars, which causes considerable mechanical deterioration.
• the aim of the present invention is to overcome these drawbacks by proposing a device for the safety and cleaning of the bars of a track of a drawing head.
• FIG. 1 is a side elevation view in section of the two tracks of a drawing head of a chain gill fitted with a safety and cleaning device according to the invention
• Figure 2 is a view similar to that of Figure 1 showing a particular embodiment of the safety and cleaning device
• Figures 3a to 3h are partial sectional views showing different embodiments of the safety and cleaning device cleaning.
• Figures 1 and 2 of the accompanying drawings show, by way of example, a chain gill, which is composed of a drawing head 1 constituted by two tracks 2a, 2b, each provided with bars 5 equipped with needles and located one above the other and placed between a pair of food cylinders 3a, 3b and by a set of stretching cylinders 4a, 4b and 4c.
• a drawing head 1 constituted by two tracks 2a, 2b, each provided with bars 5 equipped with needles and located one above the other and placed between a pair of food cylinders 3a, 3b and by a set of stretching cylinders 4a, 4b and 4c.
• a safety and cleaning device which comprises a cylindrical brush 13 driven in a rotational movement and whose position relative to the drawing head 1 is modified following a winding of textile material around a track 2a, 2b.
• the direction of rotation of the cylindrical brush 13 is opposite to the direction of movement of said bars 5.
• the cylindrical brush 13 in the operating position, is arranged on the distance path B, C, preferably as close as possible to the stretching cylinders 4a, 4b, 4c.
• the positioning of the brush 13 can be modified relative to the drawing head 1 successively in the bar cleaning position, then in the release position.
• the brush 13 can be moved away from the stretching cylinders 4a to 4c, in order to facilitate the disassembly of the pressure cylinder 4c.
• the device is provided with a sensor 14 for detecting the position of the brush 13 relative to the drawing head 1, this sensor causing the machine to stop in the event of removal of the brush 13 following a winding of textile material around a track 2a, 2b.
• the axis of rotation 15 of the cylindrical brush 13 can be mounted on a lever 16 pivoting about an axis 17 fixed relative to the frame of the machine and integral with the latter.
• the fixed axis 17 is preferably secured to the track 2a, 2b. According to an alternative embodiment of the invention, shown in Figure 3 has the accompanying drawings, the fixed axis 17 can also be secured to the cover of the machine.
• the fixed axis 17 of the lever 16 for supporting the cylindrical brush 13 can also be integral with the axis of a cylinder 4a, 4b, 4c of the drawing train (FIGS. 3b, 3f, 3g).
• the cylindrical brush 13 is preferably pressed against the bars 5 of the track 2a, 2b by gravity.
• a support means 19 can be provided, such as a spring or a jack which ensures contact between the bristles of the cylindrical brush 13 and the bars 5.
• the lever 16 which can be in the form of a movable bearing, can occupy two extreme positions, one of which is said to clean the strips 5 and the other, dotted in Figure 2, is said to release .
• the lever 16 can cooperate, in the release position, with an elastic lock provided on the frame of the machine, such as a ball constrained by a spring to penetrate into a corresponding imprint of said lever 16
• an elastic lock provided on the frame of the machine, such as a ball constrained by a spring to penetrate into a corresponding imprint of said lever 16
• the cylindrical brush 13 is mounted on an axis 15, the lateral ends of which are conical and provided with means for driving in rotation such as a pin. At each of its ends, the axis 15 is held tight and centered by its conical surfaces between two supports, one of which is provided with a compression spring intended to exert an axial force in the direction of the support located opposite .
• This latter support is provided with a means for driving the axis of the brush in rotation such as a groove. (not shown) intended to cooperate with the pin placed in the axis of the brush.
• the cylindrical brush 13 can be provided on an axis 15, at one of its ends, a pinion or a rotational drive pulley 22 secured to said axis 15 by means of a groove support (not shown).
• This assembly allows the cylindrical brush 13 to be perfectly centered, maintained and rotated and that its disassembly can be carried out easily, by manually forcing the supports to move away from one another.
• the cylindrical brush 13 In the position for cleaning the bars 5 of the track 2a, 2b, the cylindrical brush 13 is brought into contact by gravity with said bars 5 and cleans them thanks to the difference in relative speed of movement of the bristles of the brush 13 relative to the bars 5.
• the pinion or the pulley 22 of the cylindrical brush 13 is driven by means of a pinion 20 placed on the track 2a, 2b and cooperating, by means of a belt 26 and a pinion 25 mounted on the pivot axis 17 of the movable bearing or lever 16, with a cascade of pinions 22, 23, 24 causing the cylindrical brush 13 to rotate in the opposite direction to the movement of the bars 5 (FIG. 2) , the axis 17 carrying, in addition, one of the pinions 24 of the cascade of pinions and a tensioner 27 ensuring a constant tension of the belt 26.
• the axis of rotation of the brush 13 is coinciding with that of the pinion 22 and the axis of the pinion 24 is coincident with the axis 17 of pivoting of the movable bearing or lever 16.
• An intermediate pinion 23 can be inserted between the pinions 22 and 24, in order to reverse the direction of rotation of the brush 13. It is also possible to achieve cooperation of the pinion 20 plac é on track 2a, 2b with a set of sprockets and notched belts (not shown) or with a set of pulleys and smooth belts (Figure 3h). In the latter case, the kinematic chain for driving the cylindrical brush 13 in rotation allows slight sliding.
• the cylindrical brush 13 is rotated by means of a belt receiving its movement from a pulley or a toothed pinion 20, said belt circulating between two detour rollers. placed symmetrically on either side of the articulation point of the mobile bearing 16.
• the transmission ratio of the drive kinematic chain of the cylindrical brush 13 is such that, on the one hand, the direction of rotation of the brush 13 is opposite to the direction of movement of the bars 5 and, on the other apart, that there is a relative speed difference between the bristles of said brush 13 and the bars 5 which it is responsible for cleaning.
• the brush 13 removes the impurities transported by the bars 5 and transmits them to a pneumatic sensor 12, which drives them towards the filter box of the machine.
• this transmission ratio is such that the peripheral speed of rotation of the end of the bristles of the cylindrical brush 13 is less than the linear speed of movement of the bars 5.
• the assembly of the pivoting device constituted by the brush 13 of the movable bearing or levers 16 and by the pinions 22, 23, 24, 25 for driving the brush in rotation is brought to bear by gravity on a stop 28 of the caterpillar 2a, 2b.
• the axis 15 of rotation of the brush 13 is located in a vertical plane different from that of the axis 17 of pivoting of the movable bearing 16 so that the whole of the pivoting device exerts a moment opposite to the stop 28.
• the contact between the bristles of the cylindrical brush 13 and the bars 5 is provided by a support means 19, such as a spring or a jack.
• the cylindrical brush 13 can also be driven directly by an electric or pneumatic motor. As schematically shown in FIG. 3d of the appended drawings, this motor can be placed inside the body of the cylindrical brush 13.
• FIG. 3 e represents another variant embodiment of the invention, in which the driving in rotation of the cylindrical brush 13 is ensured by the movement of the bars 5 themselves, an additional means, such as a mechanical brake, electric or pneumatic slowing down the speed of rotation of the brush 13, in order to create a speed difference between the bars 5 and the brush 13, to allow brushing of the bars 5.
• an additional means such as a mechanical brake, electric or pneumatic slowing down the speed of rotation of the brush 13, in order to create a speed difference between the bars 5 and the brush 13, to allow brushing of the bars 5.
• the cylindrical brush 13 is driven in rotation by the stretching cylinders 4a, 4b or 4c, by means of a belt 21 which rotates the cylindrical brush 13 from the pressure cylinder 4c of said stretching cylinders. It is also possible, as shown in FIG. 3g, to carry out the rotation drive of the cylindrical brush 13 by the stretching cylinders 4a, 4b or 4c, by means of a cascade of pinions acting on the cylindrical brush 13 and cooperating with said stretching cylinders.
• the sensor 14, integral with the track 2a, 2b, is a position sensor of the movable bearing 16 relative to the stop 28, which detects the movement of the movable bearing 16 and causes the machine to stop when the movable bearing 16 is separated from the stop 28.
• the bars 5 carry with it the textile material along their distance B, C and the brush 13, responsible for cleaning the bars 5 removes the textile material from the bars 5 by winding it around itself around the brush 13, which has the effect of increasing the apparent outside diameter of the cylindrical brush 13.
• This increasing the diameter of the brush causes said brush to move away from the bars 5 and to pivot the movable bearing or lever 16, which is detected by the sensor 14, which controls the stopping of the machine.
• the invention it is possible to reduce the frequency of winding formation, to detect too much fouling of the brush, to avoid mechanical damage following a winding of textile material around a track and to keep the strips.
• the invention allows an increase in the cleaning intervals of the brushes and, consequently, improves the efficiency of the machine and reduces the working load.
• the invention allows the removal of the brush placed on the return path of the bars.
• the movable bearing 16 is held in this release position by means of an elastic lock, integral with the movable bearing 16 and consisting, for example, of a ball constrained by a spring to penetrate in an imprint arranged in the track 2a, 2b.
• an elastic lock integral with the movable bearing 16 and consisting, for example, of a ball constrained by a spring to penetrate in an imprint arranged in the track 2a, 2b.
• the safety and cleaning device allows free access to the mechanical organs of the machine, in particular to the cylindrical brush 13 itself and to the pressure cylinder 4c, so as to allow easy disassembly of said organs of the machine.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Cleaning In General (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Brushes (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32338916

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (3)

• 2002
  • 2002-12-17 FR FR0216036A patent/FR2848576B1/fr not_active Expired - Fee Related
• 2003
  • 2003-11-27 RU RU2005122506/12A patent/RU2343236C2/ru not_active IP Right Cessation
  • 2003-11-27 EP EP03796116A patent/EP1583854A1/fr not_active Withdrawn
  • 2003-11-27 WO PCT/FR2003/003517 patent/WO2004065672A1/fr not_active Application Discontinuation
  • 2003-11-27 CN CNB2003801060974A patent/CN100427656C/zh not_active Expired - Fee Related
  • 2003-11-27 AU AU2003298376A patent/AU2003298376A1/en not_active Abandoned

Non-Patent Citations (1)

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