EP1106554A2 - Movable folding apparatus and folding triangle arrangement - Google Patents

Abstract

The movable folding apparatus (120, 121) has a fitting (34) which is movable on a rail pair (130). A setting member moves the apparatus on the rail pair. The folding apparatus fitting runs on the rails by means of bearings. The folding apparatus can be fitted to a rotary newspaper printing press along with a folding apparatus fitting with three rows of folding correctors.

Description

The present invention relates to a movable folder and a Folder arrangement for folding a large number of printed web strands in a web-fed rotary printing press.

A large number of paper webs are usually used in newspaper production several printing units and one or both sides with a single or multi-colored Printed picture. Then the printed webs are cut lengthwise into web strands cut the one former section with one former or more Folders are fed by longitudinally folding the web strands. Before that Web strands are fed to the former, they are usually before Running into the former section and also after leaving the The former section is placed one above the other by means of guide rollers, so that the desired The finished newspaper is paginated and divided into sections.

After leaving the former section, the and longitudinally folded web strands overlaid one more time and one subordinate folder supplied, in which they are folded transversely, in individual signatures cut and then transported to a mailroom where the finished newspapers are collected, stacked and made ready for dispatch.

According to the prior art, former sections usually comprise three Folding former pairs of folding former arranged one above the other and a stationary one in the Printer arranged folding device, the one lying on top of each other and folded lengthways Web strands are fed. The supply of the folded, one on top of the other Web strands to the folder are made by means of a variety of each below Folder arranged guide rollers, around which the longitudinally folded, one above the other horizontal strands are guided.

Due to the so-called radius effect, which results from the fact that the outer web strand has a larger one around a deflection roller Distance from the center of rotation of the roller as the inner web strand occurs, it happens frequently to wrinkles and other damage to the printed webs that affect the printed image and thus affect the quality of the newspaper. In particular, there is a risk that the web strands tear, wrinkle or crinkle due to the different web tension tangle, which also affects print quality. There is also a risk of smearing the freshly printed ink on the deflection roller or of Shifts in the so-called cut register, which determines the position at which the Web strands in the folder are cut transversely so that a finished cut Newspaper is created.

The main parameters that determine the likelihood of the above Damage to the printed product is the pagination of newspapers Diameter of the guide rollers, the angle at which the web strands around the Guide rollers are guided, the section length, the number of gathered Sections and the diameter of the press or pull rolls that cover the web strands guide the former and are arranged below the former, as well as the Ability of the drawing rollers to hold the paper.

One of the main problems during the operation of the printing press is that strong wrinkles that can cause cracks, not just visible ones Impairment of the print image, but also paper jams in the Can cause folder, which inevitably leads to a longer machine stop and can lead to a loss of production of the printing press.

In US 5,775,222 a rotary printing machine is described, the folder comprises which are movable by means of a yoke. One of the folders can be used as Main folder are used, so that the other as a replacement folder Available. GB 1,490,675 describes a method for exchanging Folders described in a printing press, in which a Folder is lowered from its operating position, essentially horizontally is moved so that it is removed from the lowered position, and the to installing folder moved substantially horizontally to the lowered position and is raised to the operating position.

Accordingly, it is an object of the present invention to provide a folder assembly in to create a web-fed rotary press that is easy to use different path configurations can be adapted.

This object is achieved by the features of claim 1.

Further features of the present invention result from the subclaims.

A movable folder arrangement according to the invention comprises a folder which is slidably mounted on a pair of rails, and an actuator that the folder moved on the pair of rails.

The actuator preferably comprises a hydraulic cylinder and a control unit to control the hydraulic cylinder. The cylinder arm of the hydraulic cylinder is preferably fixedly attached to the base and the cylinder body of the hydraulic cylinder attached to the folder. The hydraulic cylinder is also preferably in the manner formed that the cylinder body is the movable member. According to a preferred This embodiment is achieved in that through the entire length of the Cylinder arm runs a hole and that the hose is attached to the end of the arm. In this way, the tubes remain stationary when the folder is moved. This compares the arrangement of hydraulic hoses with conventional hydraulic cylinder assemblies in which the hydraulic hoses can be moved back and forth with the cylinder.

The movable folder assembly can be used in conjunction with the following described former arrangement or with a conventional folder arrangement be used. The use of a movable folder reduces the Time required to restart the folder after a malfunction by a replacement folder is moved to the failed folder position, whereby the webs do not re-adapt to a change in the position of the folder must be aligned. If the movable folder in connection with the Fold former arrangement described below, this results in the Advantage that the path can be changed automatically in a simple manner because the Folder can be easily moved under the former, at the largest number is folded by web strands.

According to a further embodiment of the present invention, the folder is open the rails preferably stored by means of bearings. The bearings are preferably as linear bearings trained. In particular, the folder is preferably at least one of the rails is supported by means of linear double bearings. The advantage of linear bearings is that a better load distribution is possible and the device less is susceptible to faults due to contamination in or on the bearings and / or rails.

The folder assembly may further include a preset device that a Variety of preset positions of the folder or folders on the Rails. This specification device is preferably an absolute position encoder educated.

According to a further embodiment, the folder arrangement comprises a first one Folder and a second folder, both slidable on the pair of rails are arranged. In one embodiment, the first folder is with the second Folders connected so that the first and second folders together along the rails are movable. In an alternative embodiment, the first and the second folder separately movable along the rails.

A first embodiment of a folder arrangement according to the invention in a Web-fed newspaper press preferably includes a first series of folders, one preferably obliquely, d. H. with an offset, below the first row of folders arranged second former form, each with a first, second and third Folding hoppers on which the web strands guided over the folding hoppers are folded lengthways, and a movable folder arranged below one of the former, the the longitudinally folded web strands after leaving the former of the first and second Folding former series are fed.

By arranging two rows of former, each with three former and a movable folder, which is under any former of the second Folding former row can be arranged, the risk of damage in the Printed image, especially of folds, creases, tears, different tensions and smearing of the paint significantly reduced.

It has also been found that the inventive folder arrangement Shift register shifts, i.e. H. the position of the printed image on the signatures, in subsequent fold section can also be reduced.

According to a further embodiment of the invention, furthermore, preferably under a large number of guide rollers, collecting rollers or Gathering rollers can be provided, which the longitudinally folded web strands of the The former and the second row of former form the movable folder feed and by means of which preferably all folded web strands before entering be placed one on top of the other in the folder.

Furthermore, it can be provided that the first and second Folding former row each have a large number of superimposed web strands in the Way that the total number of over the former of the second former row guided superimposed web strands is greater than the total number of over the former of the first row of web guides.

From the fact that a different number of superimposed The web strands over which the former can be guided have the advantage that more Variations in pagination, i.e. H. the page division of the newspaper are possible, since four Web strands or half webs usually form a newspaper section. By a Varying number of web strands on each former can be the desired one Arrangement of newspaper sections can be achieved with a higher degree of flexibility.

In this context, it has also proven to be advantageous if the total number of the superimposed web strands, over the former of the second former row greater than the total number of over the former of the former The former is a series of web strands, as this causes the formation of folds or creases and thus damage to the printed image can be reduced.

According to a further embodiment of the invention, it can be provided that at least two of the former of the first former or the second series Folding former series a different number of superimposed web strands is performed, and in particular that over two formers of the first series of formers two superimposed web strands are guided. In this embodiment, the Folding former over which most of the web strands are guided, preferably outside in the first former former row (i.e., in the outer area).

In particular, it has proven to be advantageous if the first one has two formers Folding former row two overlapping web strands and over the third Folding hoppers in the first row of folding hoppers, four superimposed web strands be performed. Furthermore, the risk of wrinkles and creases may further increase that the two formers over which the two are stacked are reduced lying webs are guided, side by side and the third former, over which At the same time, four tracks lying one above the other are guided, outside in the first Folding former row (i.e. in its outer area) are arranged.

Furthermore, it can be provided that the at least two of the former form the second Folding former series a different number of superimposed web strands to be led. In this embodiment, the folder is preferably below the The former of the second row of former is arranged over which the largest number superimposed web strands is guided so that these web strands directly to the Folder can be fed without it before entering the folder are guided over guide rollers.

According to a further embodiment of the present invention, a movable one Folders are used, through which the course of the folded web strands can be changed much easier since the folder is easily one of the largest Number of web former folding hoppers can be moved.

According to a further embodiment of the invention, preferably over two Folding hoppers of the second series of folding hoppers four web strands and one above the other over the third former of the second series of eight former Led strands. In this embodiment, the two formers are preferably over the four strands, arranged side by side and accordingly the third former, over which eight web strands are guided, outside in the second Row of former hoppers, preferably arranged directly above the movable folder.

In a further embodiment of the invention, the former are the former Preferably, the former series with respect to the former of the second former series arranged in a line so that, for example, the top of a former of the first Row of former and the top of a former of the second former reach in one lie essentially vertically through the plane of the former.

Alternatively, it can also be provided that the former of the first series of former and the former of the second former series in such a way that they are offset from one another are arranged so that the tips of the former of the first former in row Essentially vertically between two adjacent formers of the the second level of the former. By such a staggered Arrangement can be the number of guide rollers for which the former of the first Row of folding former leaving superimposed web strands and accordingly the Risk of wrinkles and creases can be further reduced.

The features of the present invention will become apparent in the following description preferred embodiments in connection with the accompanying, below listed drawings explained in more detail.

Fig. 1

eine schematische Darstellung einer Ausführungsform einer erfindungsgemäßen Zeitungsdruckmaschine;

Fig. 2

eine schematische Detailansicht der erfindungsgemäßen Falzapparatanordnung mit zwei Reihen à je drei Falztrichtern und eine schematische Darstellung eines bewegbaren Falzapparats;

Fig. 3

eine schematische Darstellung der in Fig. 2 gezeigten Falztrichteranordnung in einer ersten Anordnungsweise;

Fig. 4

die in Fig. 2 gezeigte Falzapparatanordnung in einer zweiten Anordnungsweise;

Fig. 5

die in Fig. 2 gezeigte Falzapparatanordnung in einer dritten Anordnungsweise;

Fig. 6

die in Fig. 2 gezeigte Falztrichteranordnung in einer vierten Anordnungsweise;

Fig. 7

die in Fig. 2 gezeigte Falztrichteranordnung in einer fünften Anordnungsweise;

Fig. 8

die in Fig. 2 gezeigte Falztrichteranordnung in einer sechsten Anordnungsweise gemäß der bevorzugten Ausführungsform der Erfindung;

Fig. 9 und 10

Falzapparatanordnungen des Stands der Technik in zwei möglichen Anordnungsweisen;

Fig. 11

eine bewegbar Falzapparatanordnung gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung;

Fig. 12

eine Detailansicht des in Fig. 11 gezeigten Falz- und Schienensystems;

Fig. 13

eine Explosionsansicht des in Fig. 12 gezeigten Falz- und Schienensystems;

Fig. 14 a und 14 b

das in Fig. 13 gezeigte lineare Einzellager; und

Fig. 15a und 15b

das in Fig. 13 gezeigte lineare Doppellager.

Show it:

Fig. 1

a schematic representation of an embodiment of a newspaper printing press according to the invention;

Fig. 2

a schematic detailed view of the folder arrangement according to the invention with two rows of three formers and a schematic representation of a movable folder;

Fig. 3

a schematic representation of the former arrangement shown in Figure 2 in a first arrangement.

Fig. 4

the folder arrangement shown in Figure 2 in a second arrangement.

Fig. 5

the folder arrangement shown in Figure 2 in a third arrangement;

Fig. 6

the former arrangement shown in Figure 2 in a fourth arrangement.

Fig. 7

the former arrangement shown in Figure 2 in a fifth arrangement.

Fig. 8

the former arrangement shown in Figure 2 in a sixth arrangement according to the preferred embodiment of the invention.

9 and 10

Prior art folder arrangements in two possible arrangements;

Fig. 11

a moveable folder assembly according to a preferred embodiment of the present invention;

Fig. 12

a detailed view of the folding and rail system shown in Fig. 11;

Fig. 13

an exploded view of the folding and rail system shown in Fig. 12;

14 a and 14 b

the linear single bearing shown in Fig. 13; and

15a and 15b

the linear double bearing shown in Fig. 13.

11 to 15 is a preferred embodiment of the movable folder 34 shown. As shown in Fig. 11, the assembly 34 includes a first folder 120, a second folder 121, a hydraulic drive unit 110 and a Rail assembly 130. In the first and second folders 120, 121 and hydraulic drive unit 110 can be any known folder and are any known hydraulic or electric drive unit. The folders 120, 121 can be of the same or different designs. In Fig. 11 is the first folder 120 z. B. as a JF 225 folder and the second folder 121 z. B. shown as an RBS 32 folder, both at Heidelberg Web Systems, Dover, USA.

The rail assembly 130 includes parallel rails 131 and 132 that are on a base 133 (Fig. 13) are attached. As shown in FIGS. 12 and 13, the first folder is 120 slidably supported on the rails 131 and 132 and respective bearing pairs 160 and 150. A hydraulic cylinder 170 is at one end via a bracket 171 on the base 133 and attached to folder 120 at the other end. The folder 121 is for reasons not shown for clarity, but is also sliding over respective bearing pairs 150, 160 arranged on the rails 131 and 132 and with the folder 120 connected so that the folder 120 and the folder 121 together along the Rails 131 and 132 are slidable. There is preferably one on the folder 120 Pressure source 110 attached, preferably as a hydrostatic pressure source is trained. The folders 120 and 121 are on the rails 131 and 132 are displaceable and are via the hydraulic cylinder 170 and the pressure source 110 controlled. The hydraulic cylinder 170 is preferably located in the pressure source 110 arranged electronic control unit controlled. Alternatively, the Hydraulic cylinder controlled by any known control unit and by be driven by any known drive device, e.g. B. over a Electric motor and a rack arranged on the rails or on the floor.

The folder assembly 34 is preferably formed in such a way that along the Rails 131, 132 a plurality of predetermined folder positions is provided. 12 and 13, this default function is performed by an absolute position encoder 176 exercised.

The hydraulic cylinder 170 shown in FIG. 13 includes a cylinder body 172 and one Piston rod 173. Piston rod 173 is via a support or bracket 171 preferably fixed to the base 133, and the body 172 of the hydraulic cylinder 170 is attached to the folder 120 by means of supports or holders 174, 175. in the Operating condition, the cylinder body 172 is the movable element, while the Piston rod 173 remains stationary. One runs through the length of the piston rod 173 Bore, and with the end 177 of the piston rod 173 is a (not shown) Hydraulic hose connected. In this way, the hose remains stationary when the Folder 120 is moved. This advantageously results in a simplified one Construction of the hydraulic hoses used compared to conventional ones Hydraulic cylinder assemblies where the hydraulic hoses back and forth with the cylinder be moved here. In the embodiment shown, the hydraulic cylinder also used to determine the folder or folders and this / n in Hold position so that no other mechanism is needed to pull the folder (s) to keep in a fixed position.

An embodiment of a bearing 150 according to the invention is shown in FIG. 14a. The Bearing 150 is designed as a linear single bearing, which is a plurality of in one elliptical - or generally non-circular - path 152 revolving rolling elements 151 includes. As shown in Fig. 14b, the rolling bodies 151 are in rolling or sliding contact with the rail 132.

An embodiment of a bearing 160 according to the invention is shown in FIG. 15a. The Bearing 160 is designed as a linear double bearing, one around a first elliptical - or generally non-circular - path 162 circumferential first plurality of rolling elements 161 and one around a second non-circular, e.g. B. elliptical path 164 orbiting includes a second plurality of rolling elements 163, the paths 162 and 164 in one

Angles, preferably at right angles, are arranged with respect to one another. As shown in Figure 15b is, the rolling elements 161 and 163 are in rolling or sliding contact with the rail 131. Since the Paths 162 and 164 are arranged at an angle to one another prevents bearing 160 a lateral displacement of the folders 120 and 130.

The use of linear bearings, i. H. of bearings with a non-circular inner Bearing body in which several of the rolling body simultaneously with a straight line tread in rolling or sliding contact offers several advantages, including an improved load distribution and less susceptibility to failure Contamination in the bearings and / or on the rails.

According to a further embodiment of the present invention, the folder is 120 is not connected to the folder 130. Instead, the folder 120 and the folder 130 each has its own hydraulic cylinder, its own, preferably hydrostatic pressure source and its own control unit and are separate movable from one another along the rails 131 and 132.

The newspaper printing press 1 shown in FIG. 1, e.g. B. a web-fed offset press, comprises a plurality of printing units 2 for printing one A large number of webs 4 fed from roller stands 6 with one or more colors Image. The roller stands 6 are preferably arranged in the basement of a printing house. To the printing process in the printing units 2, the webs 4 of an invention Folder assembly 8 fed, preferably in the middle of the Newspaper printing machine 1 is arranged, but also on one side of the printing press or can be arranged at one end of the printing press.

As is shown in more detail in FIG. 2, the former arrangement 8 according to the invention comprises one first row 10a with, for example, three formers 12, 14, 16 and a second row 10b with, for example, three further formers 18, 20 and 22.

After the printing process in the printing units 2 and before entering the The former 4 is preferably the webs 4 in individual strands or half Sheets 24 cut, which are then by means of the above the respective former 12, 14, 16, 18, 20, 22 arranged rollers 26 (guiding or deflecting rollers) the formers 12, 14, 16 and 18, 20, 22 of the first and second former rows 10a, 10b.

According to one embodiment of the invention, a multiplicity of web strands 24, are arranged one above the other before they are fed to the formers 12 to 22, where four web strands or half webs 24 are typically a section of a newspaper form. The superimposing or overlapping of the web strands 24 can for example by means of the conventional collection or Removal rollers 28 take place, which are often referred to as collating rollers.

After passing through the formers 12 to 22, they are placed one above the other Web strands 24 fed to a pair of pressing or pulling rollers 30, whereby the one above the other laid web strands 24 are folded lengthways. After passing the pull rollers 30 are the longitudinally folded, superimposed web strands 24 over a variety of Guide rollers 32 fed to a folder 34. As indicated by arrow 36 in FIG. 2 is indicated, the folder 34 is preferred with respect to the former 12 to 22 movably arranged. The folder 34 can be, for example, a conventional one Folding apparatus can be formed which the incoming, superimposed web strands 24th cuts into a variety of newspapers 38, which are then folded transversely and by means of a known paddle wheel arrangement 42 are placed on a conveyor belt 40 can. The conveyor belt 40 preferably transports the newspapers 38 in one Scale flow to a further processing station (not shown), e.g. B. one Shipping room.

As described in more detail below, there are different possibilities in FIGS. 3 to 8 shown how the web strands 24 can be guided over the former 13 to 22.

3 to 5 show a first, second and third arrangement, in each of which 16 pages, i. H. four superimposed web strands 24, each printed on both sides, over the Folding former 12 to 22 of the first and second series of folding former 10a, 10b are guided. In Depending on the position of the folder 34 was one for each arrangement Assessment number determined, which reflects the probability with which it to Formation of wrinkles or creases is coming. 3 and 4 Orders, this probability index is 30. As it turns out, the probability index with the arrangement shown in FIG 26.5 are reduced to the arrangement of the guide rollers according to the invention shown, the subsequent, successive superimposition of the individual, from only one side incoming web strands 24 and the straight feeding of the web strands 24 to Folder 34 can be attributed.

In the fourth, fifth and sixth arrangement shown in FIGS. 6, 7 and 8, the Folder 34 each fed the same total number of web strands 24. Because of Another pagination of the newspaper are the former 13 and 16 of the first Folding former row 10a, however, eight sides and over the former 22 of the second Folding former series 10b 32 pages, d. H. eight layers, guided. The probability index could thereby from 26.5 in the arrangement shown in FIG. 6 to 25.5 for the one in FIG. 7 arrangement shown and even reduced to 23.0 for the arrangement shown in FIG become. As mentioned before, the falling probability index can be reduced possibly on the different positions of the folder 34 from one Position on the far left in FIG. 6 to a position on the far right in FIG. 8 and to that in FIG. 8 shown successive, successive superimposition of those of only one (in shown example of the left) side incoming folded web strands 24 below the Return the former 22.

The reduction in the probability index in the arrangement shown in FIG. 8 However, there can also be other causes, for example the straight supply of the heaviest newspaper section (32 pages), which is fed directly to the folder 34.

In the prior art folder shown in Figs. 9 and 10 with a stationary folder 134, the probability index in FIG. 9 is 35 and in FIG. 10 at 35.5, although the total number of web strands fed to folder 134 is the same as that of the invention shown in Figs. 3 to 8 Folder arrangements.

Furthermore, displaceable folding devices make it easier to exchange one Folder in the event of a defect or a long press with more than a folding section the installation of an additional folder, on which if necessary can be used. The folders are preferably on rails slidable. Hydraulic, for example, can be used to move the folders Control elements or servomotors can be provided. To improve web strand handling the folders are preferably displaceable during printing.

As shown, the probability index is the different one shown in Figs Folder arrangements 8 according to the invention always lower than that Probability index of the folder arrangements shown in FIGS. 9 and 10 of the State of the art.

The present invention is not limited to that described here in particular in FIGS. 3 to 8 Orders limited. It is Z. B. an offset arrangement of the former 12, 14, 16th of the first former row 10a with respect to the second former row 10b or one staggered arrangement of two adjacent formers 12 to 22 in one Row 10a, 10b conceivable, whereby the probability index may still can be further reduced. Also the number of those fed through the formers 12 to 22 Web strands 24 can be changed in any manner to the desired Achieve pagination and division of the newspaper.

According to a further embodiment of the invention, two can be stacked arranged former form rows with three formers with two preferably sliding folder with separately driven former rollers and / or Pull rollers are combined in such a way that that of the different formers incoming web strands can be fed to any of the two folders. In In this embodiment, two print jobs can be executed independently be, for example, the printing press for print jobs with train paths to be able to start and stop at different lengths, which is particularly noticeable as turns out to be advantageous that several railway tracks of short length to an existing one Configuration for an ongoing print job can be added.

List of reference numbers

1

Newspaper printing press

2nd

Printing units

4th

Tracks

6

Roll stand

8th

Folder arrangement

10a

first row of formers

10b

second row of formers

12th

Former

14

Former

16

Former

18th

Former

20th

Former

22

Former

24th

Web strands

26

Rollers

28

Collection or removal rollers

30th

Pull rollers

32

Guide rollers

34

Folder

36

Direction of movement

38

Newspapers

40

Conveyor belt

42

Paddle wheel arrangement

110

hydraulic drive unit

120

Folder

121

Folder

130

Rail arrangement

131

rail

132

rail

133

Base

134

stationary folder

150

Bearing pair

151

Rolling element

152

elliptical path

160

Bearing pair

160

camp

161

Rolling element

162

elliptical path

163

Rolling element

164

elliptical path

170

Hydraulic cylinder

171

carrier

172

Cylinder body

173

Cylinder arm

174

carrier

175

carrier

176

Absolute position encoder

177

The End

Claims (13)

Movable folder arrangement (34), with a folder (120, 121) slidably mounted on a pair of rails (130)
marked by
an actuator (170, 171, 173, 177) for moving the folder (120, 121) on the pair of rails (130). Device according to claim 1,
characterized by
that the actuator comprises a hydraulic cylinder (170) and a control unit for controlling the hydraulic cylinder (170). Device according to claim 1 or 2,
characterized by
that the folder (120, 121) is supported on the rails of the pair of rails (131, 132) via bearings (150, 160). Device according to claim 3,
characterized by
that the bearings (150, 160) are designed as linear bearings. Device according to claim 4,
characterized by
that the folder (120, 121) is supported on at least one of the rails (131, 132) via linear double bearings (160). Device according to claim 4,
characterized by
that the folder (120, 121) is supported on one of the rails (131, 132) by means of linear double bearings (160) and on the other rail by means of linear individual bearings (150). Device according to one of the preceding claims,
marked by
a specification device which specifies a number of preset positions along the rails (131, 132) into which the folder can be moved. Device according to claim 7,
characterized by
that the specification device comprises a position transmitter (176) which determines the positions of the folder on the rails (131, 132). Device according to one of the preceding claims,
marked by
a further folder (121) which is arranged displaceably on the pair of rails (130). Device according to claim 9,
characterized by
that the folder (120) is connected to the further folder (121) in such a way that the folders (120, 121) can be moved together on the pair of rails (130). Device according to claim 9,
characterized by
that the folding devices (120, 121) can be moved separately from one another on the pair of rails (130). Device according to claim 9,
characterized by
that the actuator comprises a first actuator for the folder (120) and a second actuator for the further folder (121). Device according to claim 1,
marked by
a first and a second former (10a, 10b), each of a first, second and third former (12, 14, 16, 18, 20, 22) for longitudinally folding one or more web strands (24) guided over the former The first row of hoppers (10a) is arranged above the second row of hoppers (10b), and the movable folder (120, 121) under one of the hoppers (18, 20, 22) of the second row of hoppers (10b ) can be arranged and slidably mounted on the pair of rails (130) by means of linear bearings (150, 160).

Images