FR2459320A1 - IMPROVEMENTS TO MACHINERY FOR TOWING FABRICS - Google Patents

Abstract

1. A self-contained machine for the preliminary fullwidth and tensionless dipping of a fabric prior to its introduction into a treatment installation, of the kind comprising, on the one hand, two superposed rows of drums (6, 7) between which the fabric (1) is returned in order to pass between ramps (10) for the spingling of the vertical lengths (1') defined on this fabric by the said rows, and, on the other hand, a series of electric motors (9) for effecting the drive under a constant torque of the drums (6) of one of the rows, characterized in that placed on the feed circuit of the motors (9), of the type having variable speed and constant torque, is an auto-transformer (20) directly controlled by a compensating roller (14) disposed, in the manner known "per se", at the outlet of the drums (6, 7) of the two rows with a view to being subjected to alternating displacements as a function of the difference in the respective working speeds of the machine and of the treatment installation fed by this latter.

Description

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  It is known that at the output of printing machines it is often necessary to wash the fabrics in order to get rid of the coating or "gum" that covers their printed side. These coatings or gums can be very resistant and it is then necessary to resort, prior to the actual washing, to a pre-soaking operation intended to soften the layer and to impregnate

  the thickness of the fabric to promote the subsequent action of net-

toyage.

  This presoaking is usually carried out using a

  grooving arranged upstream of the washing installation. This device-

  It operates continuously and obviously does not have to

  no slowdown in the operation of the washing installation. It should therefore contain a length of very important fabric, of the order of several tens of meters. This is how we proposed to vertically return the fabric between

  two superposed rows of drums associated with spray booms.

  Each drum obviously has a significant braking effect, so that when calling, for example using rollers

  suitably arranged, said fabric at the exit of the

  pre-soaking, it frequently happens that as a result of the excessive tension thus applied to the fabric, it creases

  longitudinally and at the same time

  missible. The improvements which are the subject of the present invention

  have the specific purpose of overcoming the precise disadvantages

  and to allow the realization of an autonomous machine

  ensure a pre-soak in wide and without tension.

  The invention consists principally in driving each of the drums

  bursary of one of the two rows superimposed using an engine

  independent electric motor with variable speed, and to modulate at any

  the speed of rotation of all said motors by means of an electric control system placed under the control of a compensating roller whose vertical displacements are function

  differences between the velocity of the fabric through the material

  pre-soak and that of the same fabric through the installation

subsequent treatment.

  It is understood that in such a process the fabric is conveyed by the drive drums which are subjected to constant torques, irrespective of their speed, so that the traction forces

  or tension exerted on said fabric are very small.

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  The accompanying drawing, given by way of example, will provide a better understanding of the invention, the characteristics that it has and the advantages that it is likely to provide. 1 is a vertical section schematically showing the general arrangement of a pre-soaking machine established in accordance with

to the invention.

  Fig. 2 shows the assembly associated with each of the drums

  driving pastors of the machine.

  Fig. 3 illustrates on a larger scale the system for

  control of electric motors in advance.

  In fig. 1 the reference 1 designates the tissue to be treated by

  soaking. This fabric 1, taken from a reserve schematized in 2, is returned to successively cross a station 3 for the unwinding of selvedges and a centering station 4, the devices

  or mechanisms provided for in items 3 and 4 being well known in

  therefore does not require any detailed description.

  At its exit from the centering station 4 the fabric 1 passes to the interior.

  a container 5 filled with a liquid product of improp-

  tion, then it is guided to be successively returned vertically

  between two superimposed rows of drums referenced 6 and 7, which thus determine on said fabric a series of vertical portions or 1 oriented parallel to each other. The

  lower drums 7 are cut with perforations and are

  ss above a tray 8, while each of the upper drums 6 is connected to an independent electric motor 9 which ensures its training.

  Each upper drum 6 is surmounted by an asper-

  10 (Fig. 2), the lower part of which is provided with nozzles

  oriented obliquely from the center to the outside and from

  - 30th part towards the upstream part in the direction of travel of the fabric 1.

  The set of ramps 10 of the machine is fed from a

  pipe 8a provided on the lower tray 8; this last collection

  the liquid which after spraying by the oblique nozzles 10 rises

  saddle along the lines 1 'and it also receives a contribution

  auxiliary makeup 12, the excess flowing through an overflow 8b.

  At its exit from the last upper drum 6, the fabric 1 is made

  upwards, not by a perforated drum 7, but by a

  compensating roller 14 (Fig. 1) provided substantially at mid-span

  between the rows 6 and 7. This roller 14 is carried by lateral arms 15 hinged in the manner of flails on pivots 16 sj

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  and it is the vertical displacements of said roller 14 which ensure

  the adjustable speed control of the drive motors 9.

  For this purpose and as illustrated in FIG. 3 one of the two arms

  swivels 15 extends beyond its pivot 16 away from the wheel.

  water 14 and on this protruding part 15a is attached the end of a cable 17 suitably returned by pulleys 18 and provided with

  at its opposite end of a counterbalance of tension 19 which does not equate

  only partially the cantilever weight of the aforementioned roller.

  On this cable 17 is fixed the mobile armature, schematized in 20a, of a self-transformer 20 connected to the electrical circuit which

feeds all the engines 9.

  It should be noted that on this power supply circuit

  There is also provided a switch 21 whose movable member 21a is connected to one of the two pivoting arms 15 and is arranged to selectively actuate four switches suitably connected to the aforementioned circuit, as will be better understood when

  will explain further the operation of the machine according to the invention

  tion. The fabric 1 returned upwards by the compensating roller 14 is lifted downwards by a final drum 6 'driven by a

  motor 9 '(fig 1) connected to the same general circuit as the

  9. It then passes through an expanding mechanism

  22, advantageously constituted by two cylinders or "lvis" striu-

  oblique res, then a centralizer device 23 of conventional type, before being finally returned to the horizontal in 24 to penetrate

  in the washing installation associated with the pre-soaking machine.

  Operationally it is understood that the maintenance of the fabric 1 through the entire machine is provided by the expanding mechanisms 3 and 22 provided at the ends of said machine, and by the action of oblique nozzles it at the level of the machine. of each of the upper training drums 6. Tests have shown

  that any untimely shrinkage of tissue 1 during pre-treatment

  page was radically avoided, at the same time that the centering devices 4 and 23 operated the correct retention of said fabric in the

  central part of the drums. This fabric presents itself in a

  made at the entrance to the treatment facility.

  It will also be noted that the recesses formed in the bottom drums 7 make it possible for the liquid which flows along the strips 1 'to flow out of the part of them which is in contact with each other.

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  with each drum, which avoids the creation of pockets of liquid

  likely to cause folds on the fabric.

  It is also conceivable that the training of this fabric 1 to

  throughout the machine is carried out without tension since

  su is moved by the upper drums 6 on each of which exerts a constant torque, regardless of the rotational speed

  9. As a consequence, the fabric 1 is subject only to its

  pre weight and effort just needed to overcome its inertia.

  The training torque is controlled by the vertical movements

  wedges of the compensating roller 14; it is conceivable that, in

  the requirements of the installation provided downstream of the machine, that is to say according to the call of tissue at the outlet cylinder 24, this roll 14, wrapped in the last fold of fabric,

  will go up or down depending on the speed of work of the machine.

  China pre-soaking. is less than or greater than that of the

  associated plant. These vertical displacements are transmitted by the cable 17 to the autotransformer 20 which consequently controls the torque of the set of motors 9 and 9 'and thus the speed of

  rotation of each one of them, so that the machine regulates itself

  -7 20 -Even without any manual intervention.

  If, however, the difference in the working speeds is at a very important moment, the movable member 21a of the switch 21 actuates one or the other (depending on the speed of operation

  of the pre-soaking machine is greater or less

  than the treatment facility) of the two contac-

  central banks, thus bypassing self-transformation

  20 and feeding the motors 9 and 9 directly to the maximum

  in one case, and by cutting the autotransformer 20, so the

  9 and 9 ', in the other case. The machine "recovers"

  speed difference and automatic regulation

  tick by the auto-transformer 20 can resume in a period of

very short time.

  If in spite of this all-or-nothing command the "recovering

  tion "does not occur and the difference in speed continues to -35 amplify, the movable member 21a comes wear against one or the other

  two side switches of the switch 21 which cause the ar-

  total rest of the machine. Thus, a security system ef-

ficient.

  It goes without saying that we can make the whole different

  accessories to improve the guidance of the tissue to be treated,

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  its regular progress and its sprinkling. Moreover and although the training of each drum 6 by a separate engine is the best solution, we can obviously connect several of

these drums have the same engine.

  It must also be understood that the foregoing description

  has been given only as an example and that it does not limit in any way the field of the invention of which we would not go out by replacing

  the execution details described by all other equivalents. We are

  in particular that the invention is applicable to any

  pre-soak tissue, especially for the purpose of bleaching thereof.

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Y R EV E ND I CA T IO0N S

  1. Autonomous machine for pre-soaking off and without

  tissue, of the kind comprising two superimposed rows of drums between which the tissue to be treated is returned, as well as ramps for sprinkling the vertical strips between said rows, characterized in that the drums of one of the

  two rows are driven by a series of electric motors in-

  dependents whose speed of rotation is at any time adjusted, for all of said engines, by the vertical displacements of a compensating roller subjected to the difference of the working speeds

  of the machine and the food processing plant

by said machine.

  2. Machine according to claim 1, characterized in that

  that the compensating roller, arranged so as to form a vertical

  -15 tical fabric at the exit of the machine, is worn by a system

  Swiveling system connected to the moving armature of a self-transformer

  I connected to the power supply circuit of the drive motors.

  3. Machine according to claim 2, characterized in thatsaelle comprises a switch controlled by the pivoting system associated with the compensator roller, which switch can automatically short circuit or cut the auto-transformer

  when the speed differences reach a predetermined threshold

born

  4. Machine according to any one of claims 1 to 3,

  Characterized in that each watering boom, mounted above each of the drums of the upper row, is provided with spray nozzles oriented obliquely so as to provide the

keeping the fabric wide.

  5. Machine according to any one of claims 1 to 4,

  characterized in that the drums of the lower row are

  perforated tubes to promote the flow of

  the along the fabric strips and thus avoid the formation of pockets

  generators of longitudinal folds.