FR2695143A1 - Method and apparatus for compacting a discontinuously formed web by welding combed locks - Google Patents

Abstract

Method for compacting a web (6E) formed discontinuously by welding combed strands by means of a hopper (51) and a pair of delivery rolls (52), characterized in that - the fan-shaped laminated web and welded is stored intermediate in the form of a loop between a transport element (21) transporting discontinuously and a transport element (30) transporting continuously, - is transported by means of driven clamping cylinders (23) continuously in the joining zone and - there is joined together in a strip of fibers, under a light stretching.

Description

The present invention relates to a method for compacting a tablecloth

  formed discontinuously by welding combed locks and a device provided on a combing machine for carrying out the process with the formation of a discontinuous sheet after combing,

  with transport elements driven in a disconti-

  bare for the fan laminated web and welded in the width of the combing tools, with a hopper for joining the web into a fiber web and with a pair of continuously driven delivery rolls,

directly behind the hopper.

  On combing machines of the aforementioned type it is customary to place the combed locks against each other in a fan and to assemble the fibers together in the zone of their covering by a pressure exerted on them.

  transversely This operation is called welding.

  The tablecloth thus formed is transported, in function

  discontinuous production, mainly at basking point, and is transformed into a

  hopper and delivery cylinders.

  Intermediate storage of the water fed by a step-by-step or no-perch process takes place before the continuous evacuation of the fiber web, in the zone in which the web is joined in the form of

corner, called meeting area.

  In this zone, the sheet is enclosed in the form of a funnel of large volume. Intermediate storage of the temporarily surplus sheet does not pose any problem.

difficulty at this place.

  This type of meeting of the sheet expanded in a fiber band must be done so that the strips of sheet remain closed in any position This can practically be obtained only if the sheet undergoes no stretching, with respect to its edges outside in

  the longitudinal direction of the fibers.

  If the drawing conditions take into account this basic principle, it forms in the center of the cone-shaped sheet of clouds During further compaction of the sheet to obtain the band of

  fibers, it follows that the fibers deviated by the

  Clouds are inserted irregularly into the fiber band. They are only returned to the desired position by means of a large number of assembly and drawing operations. For this purpose extremely complex installations and

additional production.

  Despite the high costs, this has always been taken for granted because it was thought that after this combing operation, assembly and drawing operations are in any case necessary for a regular distribution of the fibers along the belts. fibers. According to this opinion, it has been proposed with the German patent DE 38 04 147 Ai to stabilize the edges of the sheet by a stream of air oriented, regular, and thus to obtain a greater homogeneity in the

cone of the tablecloth.

  Since the excess length of the step-by-step web must in any case be stored inside this web cone, the principle effects on the fibers in this zone are not improved by this method. action of the air We can not detect even

  not in these intend to do it.

  The sheet continues to be subject to cloud formation and irregular insertion of fibers into

the band.

  The ED 450 360 offers a device for producing a fan-shaped laminated sheet with continuous pulling cylinders.

  combed locks are sent by the alternative clamp-

  two pairs of tearing rollers adjacent to each other Conveyor belts combine these combed locks so that one of them overlaps one another.

  the other and "welded", they form a closed sheet.

  The fiber web is here delivered continuously.

  The webs thus formed can be joined reliably, retaining the structure of longitudinally oriented fibers.

  In this context no proposals have been made

  In order to obtain a uniform distribution of fibers along the axis of the strip, it is also assumed that the following assembly and drawing operations,

  anyway inevitable, will ensure this.

  This device has not been widely applied because the alternative allocation of the combing elements to one of the two pairs of tearing cylinders makes the combing tools and their drive mechanisms complex, with control movements already complicated for the work items and because of the

large frequencies.

  Reliable operation can hardly

  be obtained with cost and complexity reason-

  Typical yields are not achieved.

  Wide application of devices of this type is hardly imaginable either because

  optimal combing is not achieved.

  It is not possible to use this machine for combing precious long-fiber wool. This means that in practice the discontinuous production of the fan-shaped and welded stratified layer

must continue to be realized.

  Subsequent processing of the fiber belts thus produced requires a large number of assembly and drawing operations. This again supposes very large sets of buildings with a high degree of air conditioning and a large number of stretches.

during the production cycle.

  The invention aims to reduce the expenses

  facilities as well as stretching operations.

  The invention proposes, while preserving a single tearing plane, to preserve, during the meeting phase of the web, the stretched position of the fibers in the web, obtained during combing, and at the same time to ensure a distribution uniform fiber along the

fiber band.

  This object is achieved according to the invention with a method of the aforementioned type in that the fan-shaped and welded layered sheet is intermediately stored in the form of a loop between a transport element transporting discontinuously and a filter element.

  transporting on a continuous basis, is

  by means of clamping cylinders driven continuously into the meeting zone and joined therein in a strip of

fibers, under slight stretching.

  The spatial and functional separation of the intermediate storage operations and the joining of the web enables the web to be brought together in a strip of fibers under optimal conditions. The distribution of the fibers along the axis of the fiber web can

approaching the optimum.

  The strip of fibers, coming from the combing machine, already has, because of this process, the properties of a band of fibers assembled and stretched several times. This saves several operations.

assembly and drawing.

  The device for carrying out this method on a combing machine is characterized in that between the intermittently transported transport elements and the hopper is provided a pair of continuously driven clamping cylinders, a free distance from the leaving the web on the transport elements driven discontinuously about the width of the combing tools and in that the peripheral speed of the pair of delivery rolls is greater than the peripheral speed of the pair of

clamping cylinders.

  Thanks to the intermediate storage of the welded web, transported discontinuously, in the free space in front of the clamping rolls, driven continuously, and at the meeting of the web while the individual fibers are stretched in a defined manner, we obtain with simple means the implementation of the method,

with significant effects.

  Since in the free space

  below the point of exit of the web, on the transport elements driven discontinuously, there is provided a storage means movable in the direction of the clamping rolls on which the web can be deposited freely, the safety of the guide web

  in the area of free space is increased.

  According to advantageous embodiments of the invention, the storage means is a storage band placed approximately horizontally, driven continuously, on the upper run of which the sheet can be deposited; the storage means is a storage cylinder and the last guide cylinder, in the direction

  transport, the storage medium, is an integral part of

  the pair of clamping cylinders These characteristics

  The main purpose of these measures is to reduce

manufacturing costs.

  In the meeting area it is possible by optimizing the stretching, the distance between the pair of

  clamping cylinders and the pairs of cylinders

  and the slope of the guide plate,

  to obtain optimum formation of the band with distribution

  uniform fiber distribution in the longitudinal direction

the tablecloth.

  According to advantageous embodiments of the combing machine,

  the distance between the pair of cylinders

  the pair of delivery cylinders is approximately between one and a half and two times the width of the worsted ply and a guide plate rising in the direction of transport of at least 200 from the horizontal, is provided between the pair of clamping rolls and the hopper; the slope of the guide plate can be

  set in conjunction with the position of the pair of cylinders

  issuers, between 200 and 700 in relation to the horizontal

tal;

  the peripheral speed of the pair of cylinders

  issuers is approximately 10% higher than the

  peripheral speed of the pair of servo cylinders

  rage; in the middle of the combing machine, starting in the feeding zone of the combing machine, one is arranged one after the other, with a plurality of web dividers in the guide plane of the web and for both parts of the web. two hoppers are provided each with a pair of delivery cylinders;

  finally to the two pairs of cylinders deli-

  vreurs is associated on a rotating mechanism for a pot

spinning, a turntable.

  For a uniform distribution of fibers along the longitudinal axis of the fiber web, the distance between the pair of draw rolls of the pair of delivery rolls with respect to the width of the worsted web and the average length fibers,

is decisive.

  The risk of rupture of the edges of the sheet by its transport in the meeting area, in a given angular range, upwards, along a plate

guide, is reduced.

  The edge fibers are pressed in this case under the effect of the force of gravity on the inner fiber layers, without this being impeded by

swirls of air and the like.

  The adjustable slope of the guide plate between and 70 relative to the horizontal is advantageous when it is necessary to treat different lengths and qualities of fibers. The optimum slope must be adapted by means of tests. The drawing must be designed so that the sheet remains stretched in the center of this meeting area, without

  cause breakage of the edges of the water table

  By correctly controlling the peripheral speed of the delivery cylinders, an optimum fiber position is ensured.

in the band.

  The division of the aquifer in the longitudinal direction

  tudinal is intended to further optimize the distribution of fibers along the belt, including in the case of large web widths, and to reduce the length of construction between the clamping rolls and the delivery rolls. case to route the two fiber strips to a rotating mechanism for a spinning pot with two trays

turns.

  With subsequent parallel treatment of these two fiber strips, a mixing effect is obtained

additional, positive.

  Various other features of the object of

  the invention also emerges from the description

detailed below.

  Forms of realization of the object of the invention

  are represented, as non-limitative examples

in the accompanying drawings.

  Fig 1 is a schematic overview in

cross section of a combing machine.

  Fig 2 is a cross-sectional view

  schematic of the storage area and meeting.

  Fig 2a shows a second variant of

realization of Fig 2.

  Fig 3 is a schematic view from above of the

meeting area.

  Fig 4 is a top view of a second variant of the meeting area, similar to that of the

  FIG. 3 consists of a sheet of fibers in two parts

  ties. Fig 5 is a schematic view from above of

  areas of combing and guiding the tablecloth of

  giant with tablecloth in several parts.

  The invention is described with reference to a conventional combing machine which is mainly used for combing wool with medium length fibers,

  synthetic fibers or mixed fibers.

  It is renounced here the detailed description of the

  operation of the combing elements It is important only that the locks 6 B gripped and combed by the tongs 1 be taken up by the tear cylinders 2 and deposited by a pilgrim movement thereof on the conveyor belt 21, fan or tile. The ends overlapping each other with two wicks 6 B 1, 6 B 2 deposited one behind the other, are pressed together and assembled together using

of so-called welding cylinders 22.

  The sheet 6 C thus assembled is deposited by the conveyor belt 21 between the guiding cylinder 24 and

  another pressure cylinder 23, on the storage tape

  The storage band 30 consists of an endless belt driven continuously in the direction of the

  transport, by two guide cylinders 31 and 32.

  The fan-laminated and welded sheet 6C, which is transported by the conveyor belt 21 in a discontinuous manner, that is to say in a pilgrim movement, is deposited on the upper strand 301 of the

storage tape 30.

  The storage band 30 moves at the speed

  average of the transport band 21 Due to the

  of the deposition point on the upper run 301 of the storage band 30, the transport differences are

  compensated within a cycle.

  Two clamping cylinders 33, 34, placed downstream of the storage band 30, rotate at the same peripheral speed as the storage band 30. These clamping rolls 33, 34 are pressed by force against each other and transport the web 6 E in a defined manner over the entire width of the combing zone B, in the meeting zone E. The meeting zone E has a guide plate 4, arranged rising in the direction of transport of

  the water table, at the upper end of which is

  cord the hopper 51 and the pair of delivery cylinders 52. The angle formed by the guide plate 4 relative to the horizontal can be adjusted in connection with a height adjustment of the compressor 5 with its hopper 51

  and its pair of delivery cylinders 52.

  This type of adjustment is necessary in particular in the context of the adaptation to the type of fibers to be treated The web joined in a fiber web 6 F is conveyed, by guide pulleys known per se, to the hopper in a turntable 61 and from there to

a pot 73.

  The area of the intermediate storer and meeting,

  shown in Fig. 2, is used as an inter-

  mediate as already described a storage tape 30

unending.

  But the manufacture of this device is relatively

  complex construction and

so its technology.

  Fig 2a shows a simpler embodiment, although slightly more bulky Instead of the storage band 30, there is provided here a cylinder

35 larger storage.

  On a first peripheral zone of this storage cylinder 35, the sheet 6D, to be stored intermediately, is deposited in positions changing at a certain rate. As soon as this intermediate storage peripheral zone is reached, the clamping cylinder 33 is forcibly pressed. against the surface of the storage cylinder 35 and form therewith the pair of clamping cylinders 33, 35A. This follows, in the manner described, the rising guide plate 4, the

  hopper 51 and the pair of delivery cylinders 52.

  Fig 3 is a top view of the web 6 E in the meeting area E Dotted lines

  each delineate a wick They define practically

  zones in which two combed locks are

  assembled together by welding.

  Because of the combing operation, within a wick, the fibers are parallel to each other along their entire length. The overlapping of adjacent combed locks is relatively restricted. In the meeting area, the fibers must be made maintain this stretched position In addition these fibers must be shared in the fiber band 6 F, which leaves the

  delivery cylinders 52 towards the tower mechanism

  7, so that they are evenly distributed

  practically homogenous throughout the

the fiber band.

  This condition is satisfied when the cone of the web between the clamping rolls 33, 34; 33, 35 and the pair of delivery cylinders 52, has a given angle and that inside this cone occurs a

slight stretching of about 10%.

  The fibers represented in a wick 6 E 1 are brought close to the hopper in a position such that

that it is represented in 6 E 2.

  This means that the fibers of a wick are displaced relative to each other so that the central fibers of the next wick overlap.

on different distances.

  The fibers are then uniformly distributed over the entire length of the fiber web 6 F, with their beginnings and ends in equal proportions. The need to further standardize the fiber webs by several assembly and drawing operations is

reduced to a minimum.

  To ensure undisturbed unwinding of the web 6 E in this meeting zone E, the web 6 E is guided on a rising plane The plane is formed by the guide plate 4 The gravitational force acting on the fibers of the web 6 E, in particular on the fibers of the edge zones, maintains the cohesion of the ply and prevents rupturing of its edges As a general rule, it suffices that the slope of the guide plate 4 and, linked thereto, the position of the hopper 51 and the pair of delivery cylinders 52, are modified to obtain a correct unwinding of the sheet. This does not preclude the provision of lateral guide surfaces on the guide plate 4 and to produce a cushion of air as much as possible without turbulence between the edges of

  the web 6 E and the guide surfaces.

  In the embodiment according to FIG. 4 it is shown that for the particularly large combers, the tablecloth

  6 is shared and in two separate meeting areas 6 E 'separated

  Each part is conveyed to a hopper 51 'and a pair of delivery cylinders 52'. To divide the sheet 6 it is necessary to make this division from the feeder table of the combing machine, using a divider. 8 and throughout the guiding and combing operation, to apply the so-called free fibers between the two parts of the sheet, to one of the parts For this purpose, blowing nozzles 81 are again inserted of the separation line of

parts of the tablecloth.

  In machines that operate with a two-part web, the two produced fiber webs are preferably conveyed to a rotating mechanism 7 with two rotating plates 71, 72 and the webs.

  6 F fibers are deposited in parallel loops.

  In subsequent operations, the webs are unwound parallel to each other. The voluntary mutual offset of the two fiber strips 6 F relative to each other increases the likelihood of uniform fiber distribution along the web. of the fiber band. The operation shown in FIG. 5 in which the sheet is divided into a large number of

  narrow bands, gives an additional chance of

  to maintain a uniform longitudinal distribution of fibers

  in the fiber band, for a short distance.

  It is for example that these different strips of tablecloth are sent to their hopper, on

  paths of different lengths The fibers are distributed

  thus weave along the axis of the fiber web or bands.

Claims (9)

  1 Method for compacting a discontinuously formed web by welding combed locks   means of a hopper and a pair of cylinders   characterized in that the fan-shaped and welded layered web is intermediately stored in the form of a loop between a discontinuously conveying transport member and a continuously transporting conveying element, is conveyed by means of rolls of continuously dragged into the meeting area and joined together in a strip of fibers, under a slight stretching.   2 Apparatus for carrying out the method according to claim 1 on a combing machine, with formation of a discontinuous web after combing, with intermittently transported transport elements for the fan-shaped layered web and welded in the width of the tools of combing, with a hopper for joining the web into a fiber web and   with a pair of delivery cylinders   born continuously, directly behind the hopper, characterized in that between the intermittently transported transport elements (21, 23, 24) and the hopper (51) there is provided a pair of clamping cylinders (33, 34 33, 35) continuously driven, a free distance from the exit point of the   layer on the transport elements (21, 24, 23)   discontinuously about the width of the combing tools (1) and that the peripheral speed of the pair of delivery rollers (52, 52 ') is greater than the peripheral speed of the pair of clamping rolls (33, 34, 33, 35).   3 Device according to claim 2, characterized   in that in the free space below the point of exit of the web, on the discontinuously fed transport elements (21, 23, 24), there is provided a storage means (33, 35) movable in the direction of the clamping rolls (33, 34,), on which the web (6 C) can be deposited   freely transversely to its direction of travel.   4 Device according to claims 2 and 3,   characterized in that the storage means is a storage band (30) placed approximately horizontally, continuously driven, on the upper strand (301) of which the tablecloth (6 C) can be deposited.   Device according to claims 2 and 3,   characterized in that the storage means is a cylinder storing dre (35).   Device according to claims 2 to 5,   characterized in that the last guide cylinder (32,), in the transport direction, of the storage means, is an integral part of the pair of cylinders of tightening (33,35; 33,32).   Device according to claims 2 to 6,   characterized in that the distance between the pair of clamping rolls (33, 34; 33, 35) and the pair of delivery rolls (52) is approximately one and a half to two times the width of the web ( 6 D) combed and in that a guide plate (4) rising in   the direction of transport of at least 200 in relation to the   zontal, is provided between the pair of cylinders of   clamping (33, 34; 35) and the hopper (51).   8 Device according to claims 2 to 7,   characterized in that the slope of the guide plate (4) can be adjusted in connection with the position of the pair of delivery rolls (52) between 20 and 70 with respect to the horizontal.   Device according to claims 2 to 8,   characterized in that the peripheral speed of the pair   of delivery cylinders (52) is about 10% higher than   greater than the peripheral speed of the pair of cylinders clamping device (33, 34).   Device according to claims 2 to 9,   characterized in that in the middle of the combing machine, starting in the feed zone of the combing machine, one is arranged one after another a plurality of web dividers (8, 81) in the web guide plane. (6) and in that for both parts of the web (6 E ') there are two hoppers (51') each with a pair of delivery cylinders (52 ').   11 Apparatus according to claim 10, characterized   characterized in that the two pairs of delivery rolls (52 ') are associated, on a rotating mechanism (7) for a   spinning pot (73), a turntable (71, 72).