EP1414726B1 - Method and winding machine for the continuous winding of a web of material - Google Patents

Abstract

The invention relates to a method for the continuous winding of a web of material (12), especially a web of paper or cardboard, on a displaceable drum of a winding roller (20), whereby the web of material (12) is guided via a partial area of a lateral surface of a preferably displaceable support drum (18) and a winding gap (22) is formed between the support drum (18) and the drum (14) during the winding process when a linear force (LK) is produced, said force being produced by at least one pressing device (56) operating on the support drum (18) and/or winding roller (20), while the support drum (18) and the winding roller thus arising (20) are kept in contact with each other as much as possible during said winding process. The inventive method is characterized in that the linear force (LK) prevailing in the winding gap (22) is produced in a regulated or controlled manner by means of an electromechanical pressing unit (56.1) which comprises a two-sided receiving unit (58) for the support drum (18) and/or drum (14). The invention also relates to a winding machine (10) for carrying out the inventive method.

Description

The invention relates to a method for the continuous winding of a material web, in particular a paper or board web, according to the preamble of claim 1 and a winding machine for continuously winding a material web, in particular a paper or board web, according to the preamble of claim 5.

Methods and winding machines of the type mentioned here are for example from the European patent EP 0 483 092 B1 or from the PCT publication WO 98/52858 A1 considered as the closest prior art is well known and are used in particular in machines for producing or refining webs, such as paper or cardboard.

In modern winding concepts today Anpresseinrichtungen be used on the carrying drums and the Tambouren (bobbins), which have hydraulic or pneumatic Anpresseinheiten. The Anpresseinheiten used tend, in particular in certain operating conditions for the generation of system vibrations, which have a negative effect on the achievable winding qualities. Furthermore, when using this type of pressing devices can not always be ensured that due to unevenness in the surface contour of the winding roll on the one hand accurate control / control of the course of the line force between the carrier drum and winding roll is possible and on the other hand no air pockets between the individual layers of the winding roll arise. Moreover, considerable problems arise in the intended maintenance of the "wrapped" web tension, so as to be able to ensure the desired winding quality in the outer region of the winding roll.

The resulting problems are greater, the faster the winding machines are operated (order of magnitude 1,500 to 2,500 m / min) and the larger the diameter of the wound rolls produced (finished reels) are (order of magnitude 2.5 to 4.5 m).

From the U.S. Patent 6,036,137 and from the PCT Publication WO 00/41959 Are winding machines with a rigidly mounted carrier drum (Pope roller) and / or with a movable drum (winding roller) known. The winding roll is at the end of a respective carriage unit, which is horizontally movable by means of at least one hydraulic cylinder unit, stored and it is fixed by means of separate clamping devices, but fixed rotatably on the carriage units. The control of the line force between the carrier drum and the winding roll is accomplished by the process of the winding roll.

Furthermore, the shows PCT Publication WO 00/17081 a winding machine with a carrier drum and with a drum (winding roller), wherein at least one roller is mounted on the end of a respective slide unit, which in turn is horizontally movable by means of at least one hydraulic cylinder unit. For coarse control of the line force between the carrier drum and the winding roll, the carriage unit is moved accordingly. A fine control of the line force is effected by an elastic element which is able to store energy and is arranged in the bearings of at least one of the two rollers in the effective direction of the line force. The control of the line force therefore basically consists of an interaction of the coarse control and the fine control.

With regard to the further control of the line force between a carrier drum and a spool (winding roller) in a winding machine by means of pressing with hydraulic or pneumatic Anpresseinheiten is on the PCT Publication WO 99/57048 and the two German publications DE 198 22 261 A1 and DE 198 52 257 A1 directed.

It is therefore an object of the invention to improve a method and a winding machine of the type mentioned above, that largely independent of the operating state no system vibrations are generated and that despite any occurring unevenness in the surface contour of the winding roll on the one hand an accurate setting, preferably control / regulation, the course of the line force between the carrier drum and the winding roll is possible and on the other hand no air pockets between the individual layers of the winding roll arise. Furthermore, the "wrapped" web tension should be maintained during the approximately entire winding process.

This object is achieved in a method of the type mentioned according to the invention that the ruling in the winding nip line force by means of an electromechanical Anpresseinheit having a two-sided recording for the carrier drum is controlled or controlled generated.

The advantage of this electromechanical Anpresseinheit is primarily that it largely suppresses the eventual generation of system vibrations completely, and they also respond quickly due to their structural properties and masses to discontinuities in the winding process, such as by the winding nip current batches and the like.

The regulation / control of the line force in the winding nip can according to the invention either via the displaceable reel drum and / or via the displaceable reel, wherein said control by means of displaceable reel has the advantage that overall less mass must be shifted and thus a more accurate and faster control / Control is possible.

Under winding technical aspects with regard to the achievable winding quality is further proposed that the line force is kept constant at a respectively predetermined value. The value is in the range from 0.05 kN / m to 15 kN / m, preferably from 0.1 kN / m to 6 kN / m, depending on the winding parameters. As a result, in particular, the qualitative winding of high-grade tissue types, such as "toilet tissue", "facial tissue", napkin paper and / or the like, wherein the line force generated in the winding nip is advantageously chosen to be less than or equal to 0.8 kN / m, in particular less than or equal to 0.5 kN / m and preferably less than or equal to 0.2 kN / m.

This object is achieved according to the invention in a winding machine of the type mentioned in that the pressing device is an electromechanical Anpresseinheit with a two-sided recording for the carrier drum and at least one means for controlling / controlling the ruling in the winding nip line force.

The advantage of this electromechanical Anpresseinheit is primarily that it largely suppresses the eventual generation of system vibrations completely, while also reacting quickly to discontinuities in the winding process, such as by the winding nip current batches and the like. Also, the further requirements of the task are solved excellently.

From a functional and cost perspective, it is advantageous if the pressing unit is formed from at least two engaging on the two-sided recording or at the two ends of the carrier drum linear drives and / or rotary spindle drives, the linear drive according to the invention from a mechanical linear unit with a mechanical drive element, in particular a Threaded cone drive or a toothed belt drive, and the rotary spindle drive according to the invention consists of a rotary spindle with a screw jack. Both drives have proven themselves many times in practice, so much in terms of their reliability and runnability as well as their maintenance and cleaning.

Furthermore, it is advantageous if the pressing unit has a Anpresshub in the range of 50 mm to 2,000 mm, preferably from 150 mm to 1,500 mm, since this stroke range is reliable in practice to control and moreover, in terms of its size is currently completely sufficient.

The pressing unit moreover has a contact pressure in the range from 0.1 kN to 50 kN, preferably from 1 kN to 25 kN. This range of forces covers today's requirements of a modern winding system with regard to the generation of line power.

The device for controlling the line force prevailing in the winding nip consists according to the invention of at least one, preferably at least one measuring device mounted on both sides, including measuring lines, at least one regulator unit, at least one setpoint generator and at least one control unit including control lines. This type of device has already proven itself many times in various applications in the paper or board industry, both in terms of their use as well as their reliability and runnability.

The measuring device consists in the first embodiment of a load cell, which is integrated in the mechanical linear unit of the pressing unit, and has a nominal force of up to 50 kN, preferably up to 25 kN on.

In the second embodiment, it consists of a torque measuring shaft, which is integrated in the rotating spindle of the pressing unit, and has a nominal torque of up to 20 Nm, preferably up to 10 Nm on.

These two embodiments have already proven themselves many times in various applications in the paper or board industry.

In order to meet the highest possible safety standard, the receptacle for the carrier drum on at least one security element, in particular a return spring with adjustable breakout force, which is introduced in the storage of the carrier drum and preferably acts in the direction of force line force. By means of this safety element, sudden forces which would certainly cause damage to the pressing device can be reliably absorbed and eliminated holistically. Moreover, such a security element is inexpensive to acquire.

It is understood that the features of the invention to be explained above and below can be used not only in the respectively indicated combination but also in other combinations or alone, without leaving the scope of the invention.

Further features and advantages of the invention will become apparent from the dependent claims and the following description of preferred embodiments with reference to the drawings.

Figur 1:

eine schematische Seitenansicht einer Ausführungsform einer erfindungsgemäßen Wickelmaschine zum Aufwickeln einer Materialbahn auf einen Tambour;

Figur 2:

eine schematische Draufsicht auf die Wickelmaschine der Fig. 1; und

Figur 3:

eine weitere stark schematische Teilseitenansicht einer Ausführungsform einer erfindungsgemäßen Wickelmaschine.

Show it

FIG. 1:

a schematic side view of an embodiment of a winding machine according to the invention for winding a web on a spool;

FIG. 2:

a schematic plan view of the winding machine of Fig. 1 ; and

FIG. 3:

a further highly schematic partial side view of an embodiment of a winding machine according to the invention.

The FIG. 1 shows in a purely schematic side view of an exemplary embodiment of a winding machine 10 for winding a web 12 on a spool 14. The web 12 may be in particular a paper or board web. The winding machine 10 may be provided in particular at the end of a paper or coating machine.

As based on the FIG. 1 can be seen, the web 12 is first passed over a web guide roller 16, deflected by this vertically upwards and then passed over a carrier drum 18, which forms a winding nip 22 with the drum 14 and with the resulting winding roll 20. About the lateral surface of the carrier drum 18, the web 12 is guided in the present case with a wrap angle of about 180 ° (partial area). The carrier drum 18 and the resulting winding roll 20 are kept as far as possible in contact with each other during the winding process in order to maintain this winding gap 22.

In a primary storage 24 a next, still empty drum 14 'is already held ready. The primary bearing 24 comprises in this case two pivotable about an axis 26 lever 28, of which in FIG. 1 only one can be seen. By means of the lever 28, the spool 14 'can be displaced along a first guide track 30, which is formed in the present embodiment by a part of a circular path. The center of the circle in question lies on the axis 26.

The spool 14 'can be acted upon by a primary drive 32, by means of which it can be set in rotation in the primary bearing 24. The prime mover 32 can be displaced along the first guideway 30.

The winding machine 10 also includes a secondary bearing 34, which may have, for example, a transport device 36 that can be moved on a linear guide (not shown). This transport device 36 serves to hold and guide a respective spool 14. In addition, rails 38 may be provided, of which in FIG. 1 only one can be seen.

The rails 38 are arranged parallel to the horizontal and fixed to a machine frame 40. Thus, a spool 14 provided with trunnions 14 can be placed on the rails 38, which means that the weight of this spool 14 and the resulting winding roll 20 is received by these rails 38.

For moving the winding roll 20 with the associated spool 14, a drive device 42 is provided, which comprises two threaded spindles 46 (dashed) that act on the two spool ends, each driven by an associated electric motor 44.

In the illustrated embodiment, the resulting winding roll 20 is moved along with the associated spool 14, for example by the transport device 36 along a second guide track 48, which is substantially runs horizontally. and lies in an imaginary first plane E1 perpendicular to the plate plane.

The drum 14 can be acted upon by a secondary drive 50, which is designed as a center drive and along the second guide rail 48 is displaced.

The driven by a merely indicated center drive carrier drum 18 is used in the present case as Anpresstrommel, where it is for example held by a guide carriage 52 which is movable on a substantially parallel to the rails 38 of the secondary bearing 34 guide 54. The center of the carrier drum 18 serving here as a movable Anpresstrommel lies on an imaginary first straight line G1, which runs parallel to the second guide track 48. In the present case, the vertical distance between the carrier drum 18 and the rails 38 is thus constant.

In the in FIG. 1 The winding drum 18 shown forms the winding gap 22 with the winding roll 20 guided by the transport device 36.

The next, still empty drum 14 'is according to FIG. 1 introduced obliquely above in the primary storage 24. By pivoting the lever 28, the spool 14 'can then be transferred along the first guideway 50 from a Anwickelposition to a transfer position, as in FIG. 1 at the end of the guideway 50 is indicated by dashed lines. Starting from this transfer position, the resulting winding roll 20 with the associated spool 14 is then transferred along the second guideway 48 in the finished winding position shown in solid lines and subsequently in a resist indicated by dashed lines Ausbringposition of which the finished winding roll 20 then, for example by means a crane from the winding machine 10 can be applied.

After separating the material web 20, the relevant web end can be wound onto the new, still empty drum 14 '. At the drum change is the still empty spool 14 'accelerated before the transfer of the web 12 of the primary drive 32 and brought to the running speed of the web 12. For the transfer of the continuous material web 12 on the empty spool 14 ', the driving speed of the winding roller 20 leading transport device 36 can be increased, for example. In this case, the carrier drum 18 is in constant contact with the winding roll 20, which means that in this phase, the support drum 18 tracked accordingly and the line force in the winding nip 22 is kept constant.

As based on the FIG. 1 can be seen, takes the introduced into the primary bearing 24 empty spool 14 'before pivoting the lever 28 down initially a direction indicated by the horizontal straight line G2 position in which the vertical distance between this horizontal line G2 and through the center of the Carrying drum 18 extending horizontal straight line G1 is less than the sum of the radii of the carrier drum 18 and the empty spool 14 '. As a result, the carrying drum 18 moved to the right finally comes into contact with the still empty drum 14 '. At the moment in which also between the carrier drum 18 and the still empty spool 14 ', a winding nip is formed, the spool change is triggered. In this Tambourwechsel the web 12 is separated by means of a separating device, not shown, transferred to the spool 14 'and wound. At the moment of Tambourwechsels, that is still before the separation and transfer of the web 12 on the empty reel 14 ', the winding roller 20 may still be in contact with the carrier drum 18. In this case, it is only after the winding of the main cylinder 14 'completely lifted off the carrier drum 18. In principle, however, it is also possible that at the moment of Tambourwechsels already a gap between the winding roller 20 and the carrier drum 18 is formed. After winding of the main cylinder 14 'this is then transferred by pivoting the lever 28 of the primary bearing 24 about the axis 26 in a clockwise direction along the first guide track 30 in the transfer position indicated by dashed lines. In this case, the spool 14 'is constantly driven by the prime mover 32. Also, this primary drive 32 is thus displaced along the first guide track 30.

During the transfer of the spool 14 'of the in FIG. 1 Anwickelposition shown by solid lines in the direction indicated by dashed lines transfer position, the support drum 18 is displaced by the associated pressing device 56 along the straight line G1, wherein the line force is maintained in the winding nip during the entire transfer to the desired value.

After the finished winding roll 20 has been moved with the spool 14 in the direction indicated by dashed lines right dispensing position, the transport device 36 and the secondary drive 50 can be moved to take over the wound spool 14 'of the primary storage 24 in the transfer position. While the transport device 36 takes over the wound spool 14 'from the levers 28 of the primary bearing 24, the secondary drive 50 is coupled to the wound spool 14', so that temporarily both drives 32, 50 are coupled to the spool 14 '. Thereafter, the prime mover 32 'is uncoupled from the spool 14' and shifted back along the first guide track 30 in the Anwickelposition counterclockwise. During the transfer of the spool 14 'from the Anwickelposition into the transfer position along the first guide track 30, the increase of the winding diameter over the carrier drum 18 associated pressing device 56 is compensated by a corresponding displacement of the carrier drum 18. In contrast, the increase of the winding diameter during a transfer of the resulting winding roll 20 along the second guide track 48 from the transfer position to the finished winding position on the drum 14 associated drive means 32 is compensated by a corresponding displacement of the main drum 14 and the resulting winding roll 20.

According to the invention, it is now provided that the line force LK prevailing in the winding nip 22 is generated or controlled by means of a pressing device 56 in the form of an electromechanical pressing unit 56.1, which has a receptacle 58 for the carrying drum 18 on both sides, wherein the line force LK in the winding nip 22 over the displaceable carrying drum 18 and / or via the displaceable drum 14 is set and the line power LK is preferably kept constant at a respectively predetermined value.

In FIG. 1 For this purpose, the pressing unit 56.1 is formed inter alia from two linear drives 60 acting on the two-sided receiver 58 of the carrier drum 18. However, the two linear drives 60 can also attack directly at the two ends of the carrier drum 18. In a further embodiment, the linear drives 60 preferably consist of a mechanical linear unit with a mechanical drive element, in particular a threaded conical drive or a toothed belt drive.

Of course, the pressing unit 56.1 can also be formed from two rotary spindle drives 62, wherein the drives 60, 62 can also be arranged on the spool 14. By way of example, two rotary spindle drives 62 are shown on the drum 14 in dashed lines. The rotary spindle drives 62 preferably consist in a further embodiment of a rotary spindle with a Spindelhubgetriebe.

The respective pressing unit 56.1 has a Anhub AH in the range of 50 mm to 1,000 mm, preferably from 150 mm to 750 mm, and a contact pressure AK (arrow) in the range of 0.1 kN to 50 kN, preferably from 1 kN to 25 kN , on.

Furthermore is in FIG. 1 It can be seen that a measuring device 64 in the form of a load cell 64.1 is integrated into the linear drive 60 of the pressing unit 56.1, wherein the load cell 64.1 has a nominal force of up to 50 kN, preferably of up to 25 kN.

When using a rotary spindle drive 62 as pressing unit 56.1 is provided as a measuring device 64 in the rotating spindle of Anpresseinheit 56.1 integrated torque measuring shaft 64.2, wherein the torque measuring shaft 64.2 has a nominal torque of up to 20 Nm, preferably up to 10 Nm.

The winding machine 1 according to the invention is also particularly suitable for the qualitative winding of higher-grade tissue types, such as toilet tissue, for example. "Facial tissue", napkin paper and / or the like, allows, with the line force generated in the winding nip, advantageously less than or equal to 0.8 kN / m, in particular less than or equal to 0.5 kN / m and preferably less than or equal to 0.2 kN / m is selected. Furthermore, it is advantageous in this winding machine 1 that the tissue web is guided over a carrier drum and subsequently wound onto a spool, wherein preferably both the carrying drum and the spool are each assigned a drive, preferably a center drive. This ensures optimal winding of the tissue web without destroying the specific volume (bulk) of the tissue web produced. Thus, with the use of two drives, in particular two center drives, in particular a reduction of the line force generated in the winding nip is possible for the carrier drum and the drum or the winding roller.

In FIG. 2 are shown in a purely schematic plan view of the support drum 18 of the pressing device 56 associated inventive device 65 for controlling or controlling the ruling in the winding nip 22 line force LK.

In this case, the device 65 according to the invention comprises at least two line force measuring devices 64, which are in FIG. 2 in the linear drive 60 of the pressing unit 56.1 is integrated as a load cell 64.1. The measuring devices 64, 64.1 are connected via measuring lines 66 to a control unit 68, which in turn is connected to a desired value transmitter 70 and a control unit 72, and deliver to this a corresponding actual value I (arrow). The setpoint generator 70 supplies the controller 68 via a line 74 to the respective setpoint S (arrow). The control unit 68 is again connected via a line 76 to the control unit 72, are controlled via the two Anpresseinheiten 56.1 according to a control line 78.

Of course, the Anpresseinheit 56.1 in FIG. 2 also be designed as a rotary spindle drive with a preferably integrated in the rotary spindle torque measuring shaft. Furthermore, the pressing unit 56.1 can also act on the drum 14 or on both units.

The pressing device 56 is thus part of a control loop which automatically adjusts the line force LK to a desired value or keeps it at the desired value. Due to the displacement of the carrier drum 18 by means of the pressing unit 56.1, fluctuations in the line force can be reliably compensated or avoided so that the particular desired winding hardness can be achieved continuously. The increasing diameter of the winding roll 20 is by a corresponding displacement of this winding roll 20 in the direction of the arrow 80, that is in FIG. 1 to the right, balanced.

The movable carrier drum 18 is tracked accordingly by the associated pressing device 56, whereby the winding gap 22 is maintained and the line force LK is kept constant in this winding gap 22 at a respectively predetermined value.

The FIG. 3 shows a further highly schematic partial side view of an embodiment of a winding machine 10 according to the invention.

According to the invention it is now provided that the receptacle 58 of the carrier drum 18 at least one security element 82, in particular a return spring with adjustable breakout force, which is introduced into the bearing 84 of the carrier drum 18 and preferably acts in the direction of force line force LK. However, in another embodiment, the security element 82 can assume any constructive shape and any functional mechanism. The pressing device 56 is shown only schematically, wherein the security element 82 can also be arranged directly in the region of the pressing unit 56.1. Of course, the arrangement of the security element 82 is also possible in the storage of the spool, this possibility is not shown.

In summary, it should be noted that a method and a winding machine of the types mentioned above are improved by the invention so that largely no system vibrations are generated regardless of the operating state and that despite any unevenness in the surface contour the winding roller on the one hand a precise adjustment, preferably regulation, the course of the line force between the carrier drum and the winding roll is possible and on the other hand no air pockets between the individual layers of the winding roll arise. Furthermore, the "wrapped" web tension should be maintained during the approximately entire winding process.

LIST OF REFERENCE NUMBERS

10

winder

12

web

14

drummer

14 '

Empty drum

16

web guide

18

carrying drum

20

reel

22

winding gap

24

primary storage

26

axis

28

lever

30

First guideway

32

primary drive

34

secondary storage

36

transport means

38

rail

40

machine frame

42

driving means

44

electric motor

46

screw

48

Second guideway

50

secondary drive

52

guide carriage

54

guide

56

pressing device

56.1

pressing unit

58

admission

60

linear actuator

62

Rotary spindle drive

64

measuring device

64.1

Load cell

64.2

Torquemeter

65

Facility

66

Measurement line

68

control unit

70

Setpoint generator

72

control unit

74, 76

management

78

control line

80

arrow

82

security element

84

storage

AH

the lifting operation

AK

Contact pressure (arrow)

E1

Horizontal plane

G1

Just

G2

Just

I

Actual value (arrow)

L

Web direction

LK

line force

S

Setpoint (arrow)

Claims (16)

1. Method for the continuous winding of a web of material (12), in particular a paper or board web, onto a displaceable spool (14) to form a wound reel (20), in which the web of material (12) is guided over a subregion of a circumferential surface of a preferably displaceable carrier drum (18) and, between the carrier drum (18) and the spool (14), during the winding operation, a winding nip (22) is formed with the production of a line force (LK), which is produced by at least one pressure device (56) acting on the carrier drum (18) and/or the wound reel (20), and also the carrier drum (18) and the wound reel (20) produced are kept in contact with each other to the greatest possible extent during the winding operation,
   characterized in that
   the line force (LK) prevailing in the winding nip (22) is produced in a regulated or controlled manner by means of an electromechanical pressing unit (56.1), which has a holder (58) on both sides for the carrier drum (18).
2. Method according to Claim 1, characterized in that the line force (LK) in the winding nip (22) is regulated/controlled via the displaceable carrier drum (18).
3. Method according to Claim 1, characterized in that the line force (LK) in the winding nip (22) is regulated/controlled via the displaceable spool (14).
4. Method according to one of the preceding claims, characterized in that the line force (LK) is kept constant at a respectively predefinable value.
5. Winding machine (10) for the continuous winding of a web of material (12), in particular a paper or board web, onto a displaceable spool (14) to form a wound reel (20), having a preferably displaceable carrier drum (18) which, with the wound reel (20), during the winding operation, to the greatest possible extent forms a winding nip (22) with the production of a line force (LK) which is produced by at least one pressure device (56) acting on the carrier drum (18) and/or the wound reel (20),
   characterized in that
   the pressure device (56) is an electromechanical pressing unit (56.1) having a holder (58) on both sides for the carrier drum (18) and having at least one device (65) for regulating/controlling the line force (LK) prevailing in the winding nip (22).
6. Winding machine (10) according to Claim 5, characterized in that the pressing unit (56.1) is formed from at least two linear drives (60) and/or rotary spindle drives (62) acting on the holder (58) on both sides or on the two ends of the carrier drum (18).
7. Winding machine (10) according to Claim 6, characterized in that the linear drive (60) comprises a mechanical linear unit having a mechanical drive element, in particular a threaded conical pulley drive or a toothed belt drive.
8. Winding machine (10) according to Claim 6, characterized in that the rotary spindle drive (62) comprises a rotary spindle with a spindle displacement mechanism.
9. Winding machine (10) according to one of Claims 5 to 8, characterized in that the pressing unit (56.1) has a pressure stroke (AH) in the range from 50 mm to 2000 mm, preferably from 150 mm to 1500 mm.
10. Winding machine (10) according to one of Claims 5 to 9, characterized in that the pressing unit (56.1) has a pressing force (AK) in the range from 0.1 kN to 50 kN, preferably from 1 kN to 25 kN.
11. Winding machine (10) according to one of Claims 5 to 10, characterized in that the device (65) for regulating/controlling the line force (LK) prevailing in the winding nip (22) comprises at least one measuring device (64, 64.1, 64.2), preferably at least one measuring device fitted on each side, together with measuring lines (66), at least one closed-loop control unit (68), at least one set point generator (70) and at least one open-loop control unit (72) together with control lines (78).
12. Winding machine (10) according to Claim 11, characterized in that the measuring device (64) comprises a force measuring capsule (64.1), which is integrated in the mechanical linear unit of the pressing unit (56.1).

Images