Abstract:
A trough mangle with a mangle roll having a diameter that is enlarged as compared with conventional trough mangles in which the only one mangle roll enlarged in diameter leads to a disproportionate increase in the mangling performance.

Description:
BRIEF SUMMARY OF THE INVENTION 
     BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The invention relates to a trough mangle having a mangle roll that can be driven so as to revolve and a flexide mangle trough associated with the mangle roll. 
     2. Prior Art 
     The invention pertains to trough mangles, which are used in commercial laundries. Here, the mangling performance of such mangles is critical. High mangling outputs are achieved in known trough mangles by the latter being provided with two or an even larger number of mangle rolls located one after another. Each individual mangle roll is assigned a curved mangle trough. The pieces of laundry are moved along on the successive mangle troughs by the mangle rolls. In order to transfer the pieces of laundry from one mangle trough to the other, curved bridges are arranged between successive mangle troughs. In order to move the pieces of laundry along on the bridges, conveying means are provided, which are usually mangle belts, as they are known. The bridges and the mangle belts require extra expenditure during the production of such trough mangles. Furthermore, during the transfer of the pieces of laundry from one mangle trough to the other in the region of the bridges and the mangle belts, malfunctions may occur which, in the extreme case, lead to interruptions to the mangling operation. Finally, the mangle belts leave imprints on the laundry which, above all in the case of table linen, spoil the visual appearance. 
     On the basis of the above, the invention is based on the object of providing a trough mangle for commercial laundries in particular which has a high mangling performance but does not have the disadvantages cited at the beginning. 
     A trough mangle to achieve this object has a mangle roll ( 10 ) that can be driven so as to revolve and a flexible mangle trough ( 12 ) associated with the mangle roll, wherein the mangle roll ( 10 ) has a diameter which is greater than 1600 mm. The fact that the mangle roll has a diameter which is greater than 1600 mm, in particular in the range between 1600 and 2600 mm, preferably between 1800 and 2400 mm, permits the performance of a trough mangle to be increased without additional mangle rolls. Surprisingly, it has been shown that the mangling performance in the trough mangle according to the invention may be doubled without the roll diameter being twice as large. The mangle performance of a conventional trough mangle with two mangle rolls which, for example, have a diameter of 1300 mm, can be achieved in the case of the trough mangle according to the invention with a single mangle roll whose diameter is around 2000 mm. This is associated in particular with the fact that the resilient behavior of the mangle trough in the circumferential direction of the mangle roll is improved at greater roll diameters. In addition, the loss of smoothing path along the bridges between successive mangle rolls and the loss of evaporation performance are dispensed with. Increasing the mangle performance by means of a mangle roll of a greater diameter instead of the previous sequence of a plurality of mangle rolls also leads to bridges between successive mangle troughs and, in particular, mangle belts susceptible to faults no longer being required. 
     The trough mangle according to the invention can also have a plurality of successive mangle rolls and mangle troughs with diameters of more than 1600 mm, in order to increase the mangle performance further. Although the pieces of laundry then also have to be transferred from one mangle trough to the other, as a result of the larger mangle rolls, the number of mangle rolls and mangle troughs can be reduced, so that a lower number of transfer operations of the pieces of laundry to following mangle troughs is required, which also leads to a reduction in the expenditure on construction and the susceptibility of such a trough mangle to faults. 
     A further trough mangle for achieving the object cited at the beginning or for developing the trough mangle described previously wherein a drive side of the mangle roll is assigned a drive, and the drive carries the mangle roll ( 10 ) on the drive side ( 33 ). Accordingly, the end of the mangle roll which is associated with a drive (drive side) is carried by the drive. In particular, the drive side of the mangle roll is mounted in the drive unit. This renders a separate bearing for the mangle roll on the drive side superfluous. In addition, the structural dimensions are reduced, since as a result of the missing separate bearing on the drive side, the drive can be placed closer to the relevant end of the mangle roll. 
     The drive side of the mangle roll is preferably mounted on an output drive shaft of the drive, specifically in particular of a gearbox belonging to the latter. Because of its design, the output drive shaft of the gearbox has an internal mounting which is suitable to absorb the bearing forces of the mangle roll on the drive side. 
     The mangle roll is connected to the drive, in particular the gearbox, via a coupling flange, according to a preferred refinement of the invention. This separate coupling flange may be provided with a torque-transmitting means to be connected to the gearbox and can be flange-mounted on the relevant end of the mangle roll in a simple way by means of screws. This makes it possible to achieve a connection between the drive, in particular the gearbox, and the mangle roll which can be produced simply and easily replaced if required. 
     A further trough mangle for achieving the object cited at the beginning or for developing the trough mangle having at least one mangle roll ( 10 ) that can be driven so as to revolve and a flexible mangle trough ( 12 ) associated with the mangle roll ( 10 ), wherein a drive ( 32 ) of the mangle roll ( 10 ) has a gearbox which is designed as an epicyclic gearbox, an angled epicyclic gearbox ( 36 ), a cyclo gearbox or a harmonic drive gearbox Accordingly, the gearbox of the drive is designed as an epicyclic gearbox. This makes it possible to reduce the drive speed of a motor, in particular of an electric motor, to the relatively low rotational speed of the mangle roll which, in particular, has a large diameter. The epicyclic gearbox makes it possible to implement large step-down ratios with small structural dimensions. Furthermore, the output drive shaft of the epicyclic gearbox has a relatively high load bearing capacity, which permits the mangle roll on the drive side to be mounted directly on the output drive shaft of the epicyclic gearbox. Use is preferably made of an angled epicyclic gearbox. As a result, the electric motor serving to drive the mangle roll can be flange-mounted on the angled epicyclic gearbox with a longitudinal axis oriented at right angles to the longitudinal axis of the mangle roll. This leads to a particularly compact structural configuration of the drive side of the trough mangle. In addition, the gearbox may alternatively also be a cyclo gearbox or a harmonic drive gearbox. 
     A further solution of the object cited at the beginning, which can also be used to develop the trough mangle having at least one mangle roll ( 10 ) that can be driven so as to revolve and a flexible mangle trough ( 12 ) associate with the mangle roll ( 10 ), wherein, on the drive side ( 33 ) and on the non-driven side ( 34 ) opposite the latter, the mangle roll ( 10 ) is connected to a frame ( 15 ) such that it can pivot, in each case via a lever mechanism ( 30 ,  31 ). Accordingly, the mangle roll is pivotably connected to a frame, in each case via a lever mechanism, both on the drive side and on the opposite side, namely the drive-free side. The lever mechanisms make it possible to connect even mangle rolls with large diameters and correspondingly high weights, but also with high contact forces on the mangle trough to the frame in a stable manner. 
     According to a preferred development of the invention, the lever mechanisms of the drive side and of the drive-free side are coupled to one another. This is preferably done by means of a compensating shaft. As a result, synchronization of the lever mechanisms associated with the opposite ends of the mangle roll is implemented, so that the mangle roll can be moved up and down without the longitudinal mid-axis of the mangle roll changing its direction in the process. 
     In a preferred refinement of the trough mangle according to the invention, the compensating shaft is arranged on a pivot axis of such a lever that belongs to each lever mechanism and on which the mangle roll is mounted. As a result, the compensating shaft can be a constituent part of the pivotable mounting of the lever mechanisms, and at the same time, connect the levers in such a way that they are pivoted to the same extent, the compensating shaft being rotatable about its longitudinal mid-axis, forming the pivots for the levers. The compensating shaft is preferably dimensioned and constructed in such a way that it is substantially free of torsion. 
     According to a preferred development of the invention, the weight of the drive mounted on the lever mechanism on the drive side can be compensated for, to be specific in particular geometrically or mechanically and/or hydraulically or pneumatically. The mangle roll, whose diameter is relatively large, requires a powerful drive. This drive, to be specific in particular the angled epicyclic gearbox as well, has a weight which has a noticeable effect on the contact force of the mangle roll against the mangle trough. Since this weight, caused by the dead weight of the drive, is present only on the drive side, according to the invention, it is compensated for by the contact force of the mangle roll on the mangle trough, exerted by the lever mechanism on the drive-free side, being increased on the opposite side in accordance with the weight of the drive. This is done either geometrically or mechanically, by that lever of the lever drive on which a pressure-medium cylinder acts in order to press the mangle roll onto the mangle trough being correspondingly longer on the drive-free side than on the drive side. Alternatively, or additionally, however, the compensation for the weight of the drive can also be carried out hydraulically or pneumatically, for example by the pressure-medium cylinder on the drive-free side having a greater piston area and, as a result, producing a contact force of the mangle roll against the mangle trough which is higher by the weight of the drive. However, the pressure-medium cylinders can also have different pressures applied to them. The piston areas of the pressure-medium cylinders can then also be equally large, that is to say identical pressure-medium cylinders can be used. 
     A further trough mangle for achieving the object cited at the beginning or else for developing the trough mangle having in particular a mangle roll ( 10 ) that can be driven so as to revolve and a flexible mangle trough ( 12 ) associated with the mangle roll ( 10 ), wherein the resilient mangle trough ( 12 ) is formed of trough sections connected to one another. Accordingly, the resilient mangle trough is formed from trough sections connected to one another. The preferably equally large trough sections of the mangle trough surrounding the mangle trough in some areas, preferably in the area of a lower half, thus extend only over part of the circumference of the mangle roll which is surrounded by the entire mangle trough. In the longitudinal direction of the mangle roll, on the other hand, each trough section extends over the entire length of the mangle roll. Dividing the mangle trough in the circumferential direction in accordance with the invention does not have a noticeable influence on the stability of said trough, but a certain flexibility or resilience is maintained. In the longitudinal direction of the mangle roll, on the other hand, in which the mangle trough is preferably intended to be rigid, the rigidity is maintained, since in this direction the mangle trough is not divided. 
     Furthermore, provision is made to construct the individual trough sections intrinsically independently. This applies in particular with regard to their (heating) energy supply. Consequently, each trough section has its own connections for the feed and discharge of the (heating) energy, for example, steam, hot oil or the like. As a result, in order to form the mangle trough, the trough sections merely have to be connected to one another. 
     According to a preferred refinement of the invention, the mangle trough is assembled from two equally large trough sections, each of which extends over approximately one quarter of the circumference of the mangle roll. The two trough sections are connected to each other in the middle (in relation to the circumferential direction of the mangle roll), that is to say approximately at the lower vertex of the semicircular mangle trough. This connection is provided by at least one welded seam running continuously in the longitudinal direction of the mangle trough. This welded seam is designed and dimensioned such that it has a section modulus which corresponds to the section modulus of the usually double-walled trough sections, so that the resilient behavior of the trough mangle assembled from the trough sections is approximately equally large in the area of the connection between the trough sections as in the adjacent areas of the mangle trough which is formed by the trough sections. This means that the mangle trough formed from the welded-together trough sections has an approximately equal section modulus over its entire course and, as a result, has an equal flexional behavior over the entire circumference of the mangle roll, as a result of which, when the mangle roll is pressed into the mangle trough, the mangle trough everywhere nestles uniformly against the mangle roll. 
     A further trough mangle for achieving the object having in particular a mangle roll ( 10 ) that can be driven so as to revolve and a flexible mangle trough ( 12 ) associated with the mangle roll ( 10 ), wherein the angle roll ( 10 ) has a wrapping which has a thickness between 6 and 25mm. This may also be a development of the mangle troughs described previously. Accordingly, the mangle roll is provided with a wrapping, which has a thickness between 6 an 25 mm, in particular 12 to 20 mm. Such a wrapping withstands the loadings which arise when a relatively large mangle roll is pressed against the mangle trough. 
     The wrapping is preferably formed in one layer, but this does not rule out the single-layer wrapping intrinsically being formed from a plurality of layers. The single-layer wrapping is closed endlessly in the circumferential direction of the mangle roll by a substantially transition-free or at least a virtually offset-free connecting seam. As a result, the wrapping of the mangle roll presses the pieces of laundry to be smoothed uniformly onto the smoothing surface of the mangle trough at all points on the circumference of the mangle roll. The wrapping formed in this way also withstands the high pressures which the mangle roll exerts on the mangle trough. 
     The wrapping is preferably formed from a felt or felt-like material. This has the requisite spring characteristics, because of the thickness specially selected according to the invention, as a result of which, in the wrapping of the trough mangle according to the invention, it is possible to dispense with the springs which are common in conventional trough mangles and which would not withstand the pressures, or not withstand them permanently, which arise in the case of trough mangles with large diameters of the mangle rolls. If appropriate, however, the (highly-loadable) springs that withstand the loadings which arise can be provided. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A preferred exemplary embodiment of the trough mangle according to the invention will be explained in more detail using the drawing, in which: 
     FIG. 1 shows a schematic side view of the trough mangle, 
     FIG. 2 shows a view of a non-driven side of the trough mangle, 
     FIG. 3 shows a longitudinal section (along a longitudinal mid-axis of the mangle roll) of the non-driven side of the trough mangle, 
     FIG. 4 shows a view of a drive side of the trough mangle, 
     FIG. 5 shows a view of the drive side with a drive, 
     FIG. 6 shows a vertical longitudinal section through the drive side, 
     FIG. 7 shows an enlarged detail of a cross section through the mangle trough in the area of the connection of the trough halves, and 
     FIG. 8 shows an enlarged detail of a cross section through the mangle roll with a wrapping. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The figures show a trough mangle for commercial laundries. The trough mangle has a cylindrical mangle roll  10 , which can be driven so as to rotate about a longitudinal mid-axis  11 . The mangle roll  10  shown here has, according to the invention, a diameter of about 2000 mm. The mangle roll  10  is associated with a flexible mangle trough  12 . The mangle trough  12  surrounds approximately the lower half of the mangle roll  10 , so that the mangle trough  12  is approximately semicircular in cross section. 
     At opposite longitudinal edges  13  and  14 , the mangle trough  12  is preferably continuously mounted on a fixed frame  15  of the trough mangle. The right-hand longitudinal edge  13  of the mangle trough  12  in FIG. 1 is associated with an inlet side  16  of the trough mangle and is firmly connected to the frame  15 . The opposite longitudinal edge  14  on an outlet side  17  is mounted on the frame  15  such that it can move on the frame  15 , via a slightly skewed swinging support  18  which is preferably continuous in the longitudinal direction of the mangle trough  12 . This mounting can be designed in the manner according to DE 197 02 644 A1, to whose entire content reference is made which reveals details of the mounting, in particular the swinging support  18 . 
     In the area of the inlet side  16  and the outlet side  17 , the mangle trough  12  can be provided with an extension pointing upward, which runs rectilinearly and is aligned somewhat obliquely, to be specific in such a way that the longitudinal edges  13  and  14  are at a distance from the mangle roll  10  in order to form a gap on the inlet side  16  and the outlet side  17 . Such a gap primarily makes it easier to insert the pieces of laundry to be mangled between the mangle roll  10  and the mangle trough  12 . The resilient mangle trough  12  nestles against the cylindrical surface of the mangle roll  10  in the semicircular area, so that the pieces of laundry are moved along through the trough mangle between the mangle roll  10  and an inner smoothing surface  19  of the mangle trough  12  by means of the mangle roll  10 , driven in a clockwise direction (drive direction  20 ) in the exemplary embodiment shown. The gap shown in FIG. 1 between the mangle trough  12  and the mangle roll  10  merely serves for illustrative purposes and explanatory purposes; in actual fact, it is not present during operation of the trough mangle. 
     The resilient mangle trough  12  is formed of two trough halves  21  and  22  in the trough mangle shown here. Each of the trough halves  21  and  22 , running uninterruptedly over the entire longitudinal direction of the trough mangle, extends approximately over a quarter of the circumference of the cover of the mangle roll  10 . The trough halves  21  and  22  are connected by a connecting line  23  running through in the longitudinal direction of the mangle roll  10 . The connecting line  23  extends on a vertical longitudinal mid-plane of the trough mangle lying on the longitudinal mid-axis  11  of the mangle roll  10 . Apart from their mirror-image arrangement about the longitudinal mid-axis of the trough mangle, the two trough halves  21  and  22  are of substantially identical design. 
     Each trough half  21  and  22  is double-walled. For this purpose, each trough half  21  and  22  has a thicker inner trough plate  24  and a thinner outer trough plate  25 . The inner sides of the inner trough plates  24  of each trough half  21  and  22 , pointing toward the mangle roll  10 , together form the smoothing surface  19  of the mangle trough  12 . The trough plates  24  and  25  are formed from high-grade steel, in particular stainless steel. The equally thick inner trough plates  24  of the trough halves  21  and  22  are about 2 to 3½ times as thick as the likewise equally thick outer trough plates  25  of the trough halves  21  and  22 . The thickness of the inner trough plates  24  lies in the range from 4 to 6 mm. Accordingly, the outer trough plates  25  are 1.2 to 3 mm thick. 
     To form the respective trough halves  21  and  22 , the inner trough plate  24  and the outer trough plate  25  of the same are welded tightly all around at the edge. Furthermore, the areas of the trough halves  21  and  22  are provided with a preferably uniform grid of connecting points  26 . In the areas of the connecting points  26 , the inner trough plates  24  are additionally welded to the outer trough plates  25 . Between the individual connecting points  26 , the outer trough plates  25  are spaced apart from the inner trough plates  24 , to be specific approximately by an amount which corresponds to the thickness of the outer trough plates  25 , preferably being somewhat less. In those areas in which the trough plates  24  and  25  are spaced apart from each other, flow ducts  27  to lead heating medium through, in particular steam or a heated liquid (hot oil) are formed within the respective trough half  21  and  22 . Alternatively, it is conceivable to connect the trough plates  24  and  25  to each other by means of longitudinal seams or transverse seams in the area of the surface of the trough halves  21  and  22 . The connection of the trough plates  24 ,  25  both along the circumference and at the connecting points  26  and longitudinal or transverse seams is carried out by means of welding, to be specific, preferably laser welding. 
     Each of the two trough halves  21  and  22  is designed independently with regard to the supply of energy. To this end, the trough half  21  has, at the upper edge region, pointing toward the inlet side  16 , and the trough half  22  has, at the upper edge region pointing toward the outlet side  17 , at least one, preferably a plurality of, steam connections. At the lower edge, close to the connecting line  23 , each trough half  21  and  22  has connections  28  to discharge condensate. Each trough half  21  and  22  preferably has a plurality of separate connections  28 . In the exemplary embodiment shown, each trough half  21  and  22  has five connections  28  to discharge condensate. If required, each trough half  21  and  22  can also have more than five connections  28 . Likewise, less than five connections can be provided if appropriate. 
     At the connecting line  23  running continuously in the longitudinal direction of the trough mangle, edges of the trough halves  21  and  22  that are directed toward one another are welded to one another, to be specific by means of a longitudinal welded seam  29 , which if required can be formed from a plurality of individual welded seams produced one after another. The longitudinal welded seam  29  is produced in accordance with a suitable, known arc welding method, under inert gas. If appropriate, however, other welding methods can also be used for this purpose. In one embodiment of the invention, the longitudinal welded seam  29  extends over the entire thickness of the adjacent edges of the trough halves  21  and  22 , specifically over the sum of the thickness of the inner trough plate  24  and of the outer trough plate  25 , which, in the area of the connecting line  23  or longitudinal welded seam  29 , rest continuously on each other in the longitudinal direction of the trough mangle, since they have already been welded to form the trough halves  21  and  22  by means of the welded seam surrounding each trough half  21  and  22  all around. Alternatively, it may be sufficient for the longitudinal welded seam  29  to extend only over the thickness of the inner trough plate  24  and not of the outer trough plate  25  as well. On the inner side of the mangle trough  12 , the longitudinal welded seam  29  is subsequently machined, by means of grinding and/or polishing, for example, in such a way that a transition-free connection between the inner surface of the inner trough plates  24  of the individual trough halves  21  and  22  is produced, and therefore a continuous smoothing surface  19  also in the area of the connecting point  26 . 
     At each of its two opposite ends, the mangle roll  10  is connected to the frame  15  via a lever mechanism  30 ,  31 . By means of the lever mechanisms  30  and  31 , the mangle roll  10  can be pressed into the mangle trough  12  and, if required, moved away from the same. One end of the mangle roll  10  is assigned a drive  32 . This side of the mangle roll  10  will be referred to below as the drive side  33 . The opposite end of the mangle roll  10 , which is not assigned a drive, will be referred to as the non-driven side  34 . This side is assigned the lever drive  31 . 
     On the drive side  33 , the mangle roll  10  is mounted directly on the drive  32  without a stub axle, specifically on an output drive shaft  35  of a gearbox belonging to the drive. This gearbox is designed as an angled epicyclic gearbox  36 . The angled epicyclic gearbox  36  has a transmission ratio (i) of 200 to 350, preferably about 300. As a result, in spite of the relatively large diameter of about 2000 mm, a circumferential speed is achieved with the mangle roll  10  which corresponds approximately to that which can be achieved in conventional trough mangles with a mangle roll of smaller diameter, namely at about 45 m/min. On the drive side  33 , the mangle roll  10  is mounted on the output drive shaft  35  of the angled epicyclic gearbox  36 , said shaft being formed as splined shaft. The angled epicyclic gearbox  36  in the exemplary embodiment shown is driven by an electric motor  37 . The electric motor  37  is flange-mounted on the angled epicyclic gearbox  36  in such a way that the longitudinal mid-axis of the electric motor  37  intersects the longitudinal mid-axis  11  of the mangle roll  10  so as to be oriented approximately horizontally, to be specific at a right angle, by the longitudinal mid-axis of the electric motor  37  running transversely with respect to the longitudinal mid-axis  11  of the mangle roll  10 . 
     On the drive side  33 , a coupling flange  39  is assigned to an end wall  38  of the mangle roll  10 . A flange plate  40  resting on the outside of the end  38  of the mangle roll  10  and belonging to the coupling flange  39  is screwed to the end wall  38 . A splined profile  41  is machined into the flange plate  40  of the coupling flange  39 . The splined profile  41  in the flange plate  40  is formed so as to correspond with the profile of the output drive shaft  35  of the angled epicyclic gearbox  36 , likewise formed as a splined profile. By plugging the output drive shaft  35  of the angled epicyclic gearbox  36  into the splined profile of the plug-on sleeve  41 , a torque-transmitting connection is made between the output drive shaft  35  of the angled epicyclic gearbox  36  and the mangle roll  10  on the drive side  33 . The plug-on sleeve  41 , in particular the splined profile of the same, is arranged concentrically with the longitudinal mid-axis  11  of the mangle roll  10  as a result of which the latter can be driven by the drive  32  so as to rotate about the longitudinal mid-axis  11 . 
     The lever mechanisms  30 ,  31  on opposite sides of the mangle roll  10  are designed equally, in conceptional terms, as parallelogram link mechanisms. However, the lever mechanisms  30 ,  31  in the exemplary embodiment shown have different dimensions. 
     The lever mechanism  30  on the drive side  33  has a (lower) double lever  42  and a single lever  43  located at a distance above it. The double lever  42  is mounted on the frame  15  at an outer end such that it can pivot about a pivot  44 . The pivot  44  runs parallel to the longitudinal mid-axis  11  of the mangle roll  10 . The pivot  44  is located beside and below the longitudinal mid-axis  11 . At an end opposite the pivot  44 , the double lever  42  is connected in an articulated manner to a piston-rod end  45  of a pneumatic cylinder  46 . A piston underside of the pneumatic cylinder  46  is pivotably mounted on the frame  15 . Between the pivot  44  at one end of the double lever  42  and the piston-rod end  45  at the other end of the double lever  42 , the drive, specifically the angled epicyclic gearbox  36 , is mounted on the double lever  42 . Furthermore, the angled epicyclic gearbox  36  is mounted at a free end of the single lever  43 . The opposite free end of the single lever  43  is mounted on the frame  15  such that it can pivot about a pivot  47 . This pivot  47  is located laterally beside and above the longitudinal mid-axis  11  of the mangle roll  10 , specifically, in the exemplary embodiment shown, approximately vertically above the pivot  44  for the double lever  42 . By retracting and extending the pneumatic cylinder  46 , the double lever  42  is pivoted about the pivot  44  and, at the same time, the drive  32  with the drive side  33  of the mangle roll  10  fixed to it is raised or lowered. Accordingly, the single lever  43  also connected to the drive  32  is pivoted about the pivot  47 , as a result of which the drive  32  and the drive side  33  of the mangle roll  10  are moved up and down on a virtually vertical path in order to move the mangle roll  10  into the mangle trough  12  and in order to move the mangle roll  10  out of the mangle trough  12 . 
     The lever mechanism  31  on the non-driven side  34  of the mangle roll  10 , designed in principle like the lever mechanism  30  on the drive side  33 , also has a double lever  32 , which can be pivoted about the pivot  44 , and a single lever  49 , which can be pivoted about the pivot  47 . The double lever  48  can also be pivoted by a pneumatic cylinder  50 . Between the opposite outer ends of the double lever  48  and at the free end of the single lever  49  a bearing  15  for the non-driven side  34  of the mangle roll  10  is attached. This bearing  51  is additionally connected to the free end of the single lever  49 . In the bearing  51 , a stub axle  53  that is firmly connected to the end wall  52  of the mangle roll  10 , on the non-driven side  34  of the same is supported and, in the exemplary embodiment shown, is designed as a sleeve. 
     The lever mechanisms  30  and  31  are synchronized, to be specific by a compensating shaft  54  in the exemplary embodiment shown. The compensating shaft  54  is located on the pivot  44  for mounting the double levers  42  and  48  on the frame  15 . The compensating shaft  54  therefore constitutes a torque-transmitting connection between the double levers  42  and  48  of the lever mechanisms  30  and  31  by transmitting the movement of one double lever  42  to the other double lever  48 . In addition, the compensating shaft  54  also serves to implement the mounting of the double levers  42  and  48  on the frame  15 . In order that the compensating shaft  54  ensures virtually identically equal pivoting of the double levers  42  and  48 , the compensating shaft  54  is designed to be substantially torsionally rigid. This is achieved, for example, by means of appropriate dimensioning of the compensating shaft  54 . 
     The double levers  42  and  48  of the different lever mechanisms  30  and  31  are designed with different lengths. Accordingly, the double lever  42  on the drive side  33  is somewhat shorter. The distances of the attachment of the bearing  51  for mounting the mangle roll  10  on the non-driven side  34  and of the angled epicyclic gearbox  36  for mounting the mangle roll  10  on the drive side  33  to the pivot  44  and to the compensating shaft  54  are equal. On the other hand, the distances of those points at which the pneumatic cylinders  46  and  50  are attached to the free ends of the double levers  42  and  48  to the pivot  44  or compensating shaft  54  are of different lengths. As a result, the pneumatic cylinder  50  on the non-driven side  34  is attached to the double lever  48  at a greater distance from the pivot  44  than the pneumatic cylinder  46  on the drive side  33 . The different lengths of the double levers  42  and  48  lead to the forces with which the mangle roll  10  is pressed into the mangle trough  12  being substantially equal on both sides of the mangle roll  10  although on the drive side  33 , because of the weight of the drive  32 , a considerable proportion of the pressing force of the mangle roll  10  into the mangle trough  12  is produced by the weight of said drive  32 . Since, on the non-driven side  34 , the weight component of the drive  32  is missing, a greater pressing force has to be exerted here by the pneumatic cylinder  50 , which is implemented by means of the longer double lever  48 . The length ratios of the double levers  42  and  48  are coordinated with each other in such a way that the longer double lever  48  on the non-driven side  34  compensates for the weight, which is missing here, of the drive  32  on the drive side  33 , specifically exerting a correspondingly higher force on the bearing  51  of the mangle roll  10  on the non-driven side  34 . 
     Alternatively, it is conceivable to make the lever ratios of the lever mechanisms  30  and  31  different in another way, in order that the lever drive  30  on the drive side  33  presses the mangle roll  10  into the mangle trough  12  with lower forces than the lever mechanism  31  on the non-driven side  34 . 
     It is also possible to design the double levers  42  and  48  to be equally long and, instead, to provide on the non-driven side  34  a pneumatic cylinder  50  with a greater piston area required to compensate for the weight of the drive  32 . 
     As a result of the diameter of the mangle roll  10  of about 2000 mm, an elastic wrapping surrounding the mangle roll  10  is primarily more highly loaded in the circumferential direction than in the case of conventional trough mangles with smaller diameters of the mangle roll. For this reason, according to the invention a special wrapping is provided. This is formed of a single-layer felt  55  with a thickness of preferably 7 to 18 mm. The felt  55  per se can comprise a plurality of layers which are permanently connected to one another and which can have identical or else different characteristics. A material web of the felt  55  formed in this way is then laid completely once around the mangle roll  10 , and the transverse edges of the material web are connected without offset at a connecting point  56 , in particular spliced. To this end, the adjacent transverse edges of the felt  55 , to be put together at the connecting point  56 , are chamfered as viewed in the cross-sectional direction of the mangle roll  10  in order to form chamfered connecting faces  57 . As a result of this chamfering, the wrapping at the connecting point  56  is exactly as thick as the felt  55  outside the connecting point  56 . The connecting faces  57  of opposite end areas of the felt  55  for forming the wrapping are connected to each other at the connecting point  56 , to be specific preferably by means of adhesive bonding or the like. Alternatively or additionally, the connection can also be made by means of sewing in the area of the connecting point  56 . 
     
       
         
               
             
               
               
               
               
             
           
               
                   
               
               
                 List of designations: 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 10 
                 Mangle roll 
                 38 
                 End wall 
               
               
                 11 
                 Longitudinal mid-axis 
                 39 
                 Coupling flange 
               
               
                 12 
                 Mangle trough 
                 40 
                 Flange plate 
               
               
                 13 
                 Longitudinal edge 
                 41 
                 Splined profile 
               
               
                 14 
                 Longitudinal edge 
                 42 
                 Double lever 
               
               
                 15 
                 Frame 
                 43 
                 Single lever 
               
               
                 16 
                 Inlet side 
                 44 
                 Pivot 
               
               
                 17 
                 Outlet side 
                 45 
                 Piston-rod end 
               
               
                 18 
                 Swinging support 
                 46 
                 Pneumatic cylinder 
               
               
                 19 
                 Smoothing surface 
                 47 
                 Pivot 
               
               
                 20 
                 Drive direction of 10 
                 48 
                 Double lever 
               
               
                 21 
                 Trough half 
                 49 
                 Single lever 
               
               
                 22 
                 Trough half 
                 50 
                 Pneumatic cylinder 
               
               
                 23 
                 Connecting line 
                 51 
                 Bearing 
               
               
                 24 
                 Inner trough plate 
                 52 
                 End wall 
               
               
                 25 
                 Outer trough plate 
                 53 
                 Stub axle 
               
               
                 27 
                 Flow duct 
                 54 
                 Compensating shaft 
               
               
                 28 
                 Connection 
                 55 
                 Felt 
               
               
                 29 
                 Longitudinal welded 
                 56 
                 Connecting point 
               
               
                   
                 seam 
                 57 
                 Oblique connecting face 
               
               
                 30 
                 Lever mechanism 
               
               
                 31 
                 Lever mechanism 
               
               
                 32 
                 Drive 
               
               
                 33 
                 Drive side 
               
               
                 34 
                 Non-driven side 
               
               
                 35 
                 Output drive shaft 
               
               
                 36 
                 Angled epicyclic 
               
               
                   
                 gearbox 
               
               
                 37 
                 Electric motor