EP1170238B1 - Turning device - Google Patents

Abstract

An inverter (1) for thin, flat products (2), especially printing substrates in a printing machine, with belts (7, 8) positioned over two deflection pulleys (3, 4, 5, 6) that are set together at 180° between the deflection pulleys (3, 4, 5, 6). Such inverter is configured so that the product (2) and the belts (7, 8) move precisely in their reference positions. This is achieved by the fact that, in the transport direction (9), after a setting region (10) at least three guide rolls (11, 12, 13) are mounted on the supporting strand sides (7', 8') of belts (7, 8) in alternating arrangement and at least one of the guide rolls (11, 12 13) has a retaining collar (14) on at least one side and at least one guide roll (18) is arranged before the setting region (10). Further, at least one guide device (19, 20, 21) is arranged to guide product (2) to facilitate inversion.

Description

The invention relates to a turning device for thin sheet material, in particular for printing substrates in a printing machine, with over two each Deflection rollers laid belts, which together between the pulleys by 180 ° are set, wherein seen in the transport direction after the Schränkungsbereich At least three guide rollers on the supporting strand of the belt in alternating Arrangement are attached.

Such turning devices are in particular for the handling of printing substrates known, for example in printing presses. In these are with a Such turning device, the printing substrates for double-sided printing turned. However, other applications are conceivable, for example in further processing the printing substrates after printing.

A turning device of the type mentioned is known from DE 29 07 110 C2 known. This is the turning device of a folding machine. The Problem with such turning devices is in an exact transport of the Good, which should be positioned as accurately as possible after the turn. This is especially for turning devices in printing presses, set up for re-printing are an essential requirement for print quality. This should be avoided become that the good loses its alignment. Therefore, the good between the Belts are held securely and it must be ensured that the belt itself not by lateral forces, in particular as a result of Guttransportes from its desired position move.

DE 24 44 697 A1 discloses a turning device for X-ray film sheets, equipped with transport rollers. These ensure that the x-ray film sheets by the alternating attachment of the transport rollers with a sufficient holding force are charged. However, the x-ray film sheets lie completely between the Conveyor belts and these are in the embodiment with the turn at one Side connected because the two conveyor belts by folding a central Fabric arise. In this way, lateral forces can not be applied to the conveyor belts act, that these by the shear forces from their desired position, in particular can move out of their mutual relative position. In a turning device of However, the above-mentioned type, the conveyor belts not in the aforementioned type be connected to each other, since the goods to be transported at the point of convergence the circulating belt is received and at the point of divergence the belt leaves the turning device again.

From DE-A-1 181 721 there is furthermore a turning device of the initially mentioned type Art known, which serves as a letter turner for stamping machines. There are to support the crossed leadership of the conveyor belts provided two auxiliary rollers, the after the crossing point above the one band and below the second one Bandes are arranged. In the drawing, these auxiliary rollers are provided with collars, However, because of the clearances shown in normal operation no hold function for the conveyor belts can have. This turning device with the purpose of letters one To supply stamping machine has none with printing or similar Machines comparable precision positioning requirements of the machine Good. Since stamping letters only requires the stamps to be hit, even a few millimeters deviation are harmless. It therefore does not need any special holding function for the conveyor belts in order to be able to guide the goods more accurately. In contrast, the precision requirements in the field of printing technology and similar machines in the range of tenths of millimeters.

The invention is therefore based on the object, a turning device of the above so-called type in such a way that the goods and the belt are exactly in their Move target positions.

The object is achieved in that at least one of Guide rollers on at least one side a retaining collar with a plant a Belt has on the support surface of the retaining collar.

The measure according to the invention, the goods safely between the goods transport Serving strand of the belt held, with the at least one retaining collar attached to one or more guide rollers to the barrel and the Holding force of the belt to stabilize between the pulleys. That's it appropriate to attach the retaining collar on the side of the rollers, on the with lateral forces must be expected, which deflect one or both belts laterally can. In particular, when a turning device larger, heavier flat goods having to turn over the belts at high speed with a wide overhang At least one such retaining collar is required. These requirements exist especially in the turning facilities of printing machines.

Developments of the invention serve to optimize the precision of the turn of the Good, by applying holding forces, where this for a secure hold of the goods are required and absorb lateral forces where they occur.

An embodiment of the invention provides that a retaining collar on the side located on the outer edge of the goods after the Schränkungsbereich after moved up. Expediently, the second upper guide roller after the Schränkungsbereich on a retaining collar, since there the greatest lateral force through the Slanting of the goods occurs. In general, it is sufficient if after the Schränkungsbereich two upper and one lower guide roller are arranged.

So that the good is held with sufficient forces between the belt is proposed that the guide rollers rest against the belt, that these from the are deflected linear direction.

In addition to the guide rollers after the Schränkungsbereich can also be provided that at least one guide roller is arranged in or before the Schränkungsbereich. This is expediently a leadership role under the supporting strand of the Straps arranged to ensure a clean run of the belt and a certain contact pressure to ensure the goods. Also, in this way, a sagging of the belt be avoided as a result of the weight of the goods.

Should a good be turned, which survives to a greater extent on the belt, such as this is normally the case with printing substrates, it is additionally expedient if at least one guide is arranged, the goods on at least one Outside leads. Thus, a guide for the guidance of the outer edge, the be moved after the Schränkungsbereich down, arranged. This is especially for harder, stiffer papers or similar goods expedient so this reliable at the end of the turning device, the level for further transport to reach. A guide may further be formed so that they the outer Edge lifts to the zenith of the turn. This is especially true for flexible papers expedient to ensure safe and timely despite the tendency to sag can be brought to another side. The two latter control devices are suitably designed as a continuous guide rail, for example in Shape of a stable wire, which bent according to the course of movement of the goods and arranged.

For the edge of the good, which moves down, then after the turn to be raised again to the horizontal plane, it is appropriate if a Guide is provided, which moves towards the end of the turn upwards Raising edge to the horizontal plane. Furthermore, should still a guide be arranged, which moves towards the end of the turn down Supports edge in the horizontal plane. It is the edge that passes through the zenith is going, and that should not move below the horizontal plane so that the Good safe transport can continue.

In this case, the guide devices can be formed in various ways. For example, the two latter may be appropriately configured Trade sliding surfaces. Of course, however, other configurations conceivable.

As a belt, a variety of types of belt can be used. It may be this is flat belts, or even wider flat belts, or it is also possible to provide several parallel running belt. A preferred embodiment However, provides that the belts are designed as V-belt, as these have a high stability. At least for the latter proposal it is expedient when the pulleys, at least where they serve as drive rollers, equipped with two-sided retaining collars. This is a high power transmission possible. Both the pulleys and other roles can be designed be that the retaining collars are designed freely rotatable relative to the rollers. To this Way, the belt can be performed without that in the holding collars a increased friction between them and the belt occur. This will be the Wear kept low.

As the straps deform due to the offset, and in particular V-belts by this deformation different angular positions of their flanks in different Have deformation areas, it is useful if the angle of the holding surfaces the collars to the angular position of the flanks of the belt at the place of are adapted to each role. For example, it was found that the Angle of the flanks of the V-belts in the area of the retaining collars of the pulleys 25 ° amounted to and by the adjustment of the V-belts in different areas of the Turning the flanks have an angle of 34 °. Will this fact taken into account in the design of the retaining surfaces of the retaining collars, it happens a clean investment of the belt to these holding surfaces and thereby to a clean, precise and wear-free running of the belts.

In addition to the aforementioned roles can still one or more additional Weghalterollen be arranged for the belt. To keep the straps well, it is there appropriate if one or more Weghalterollen have both sides retaining collars. It can be provided that at least one Weghalterolle to the good leading strands of the belts are arranged, or when one or more Weghalterollen are arranged on the returning strand of the belt. In the latter case the at least one Weghalterolle may be arranged such that it is a collision of the goods with the returning strands of the straps prevented.

Fig. 1

ein Ausführungsbeispiel der Erfindung in Seitenansicht,

Fig. 2

eine Einzelheit der Fig. 1,

Fig. 3

eine weitere Einzelheit der Fig. 1,

Fig. 4

ein weiteres Ausführungsbeispiel der Erfindung in perspektivischer Ansicht und

Fig. 5

eine Druckmaschine mit einer Wendeeinrichtung.

The invention will be explained below with reference to the drawing. Show it

Fig. 1

an embodiment of the invention in side view,

Fig. 2

a detail of Fig. 1,

Fig. 3

another detail of Fig. 1,

Fig. 4

a further embodiment of the invention in a perspective view and

Fig. 5

a printing press with a turning device.

Fig. 1 shows an embodiment of the turning device 1 according to the invention in side view. A thin, flat material 2, for example a printing substrate, is fed in the direction of the arrow 9 of the turning device 1. The transport and the turn done by means of two belts 7, 8, which are associated with each other so that two runs 7 'and 8' in the direction of the arrow 9 and thereby transport the thin sheet material 2. The belts 7 and 8 are so limited that in front of a Schränkungsbereich 10 the strand 7 'above and the strand 8' below and after the Schränkungsbereich 10 the strand 8 'above and the strand 7' below. By this adjustment of the belt 7 and 8 held between the strands 7 'and 8' Good 2 is turned by 180 °, so that after the turn the two outer edges 16, 16 '(see Fig. 4) are reversed and the Previous bottom is located above.

The belts 7 and 8 are supported by pulleys 3, 4, 5 and 6. It is the Belt 7 is supported by an upper deflection roller 3 and a lower deflection roller 4. Between the underside of the guide roller 3 and the top of the guide roller. 4 runs the Good 2 leading run 7 'and from the bottom of the guide pulley 4 to Top of the guide roller 3 runs the returning run 7 " from the lower pulley 5 above the upper pulley 6 below the Good 2 leading strand 8 'of the belt 8 and from the top of the guide roller 6 to the bottom the pulley 5, the returning strand 8 "of the belt 8. It goes without saying Action required so that the returning strands 7 "and 8" are not rub against one another or on the leading strands 7 'and 8'. For example, for that a slight inclination of the pulleys 3, 4, 5 and 6 are used. Also you can too This purpose Weghalterollen 24 are used, which expediently two Holding collars 14 and, for example, a returning strand 8 "forward and deflect the other returning strand 7 "to the rear only one Weghalterolle 24 located, it can of course at all Trums 7 ', 7 ", 8', 8" one or more Weghalterollen 24 may be provided.

Since there is a problem with such a turn that goods 2 held securely must be aligned and aligned in the turn parallel to the transport direction 9 have, it is proposed that at least three guide rollers 11, 12 and 13 are arranged after the Schränkungsbereich 10. The guide rollers 11, 12, 13 arranged alternately on the strands 7 'and 8' such that they the belts 7 and 8 deflect to a slight extent from the linear direction, so that the contact pressure of this Trums 7 'and 8' on the goods 2 is increased.

Since the turning Good 2, the belt 7 and 8 applied with transverse forces, is proposed at least one of the guide rollers 11, 12, 13 with at least one Equip retaining collar 14. Preferably, the guide rollers 11, 12, 13 are so arranged that at the top of two guide rollers 11 and 13 are located and between a lower guide roller 12 is arranged. The second upper guide roller 13 is equipped with a retaining collar 14 in the rear region, ie on the side 15 (See Fig. 4), on which the outer edge 16 of a good 2 after the Schränkungsbereich 10 moves up. This ensures that the absolute Positioning and the mutual relative positions of the strands 7 'and 8' obtained stay and thus also the positioning of the thin sheet material 2.

Fig. 2 shows a detail of Fig. 1, specifically, the guide roller 13 with the retainer collar 14. It must at the angle of the holding surface α 22 of the retaining collar 14 be noted that this with the angular position of the flanks β 23 of the belts 7, 8, the these have on the guide roller 13 matches. Due to the setting, however, the angular position β of the flanks 23 of the belts 7, 8 is different. Therefore, the angle α of the support surfaces 22 of the guide roller 13 or another roller 3, 4, 5, 6, 11, 12, 13, 18, 24, which is equipped with a retaining collar 14 must be different and the respective angle β Flanks 23 of the belt 7, 8 correspond, depending on where a belt 7 or 8, such a guide roller 11, 12, 13, 18 or a deflection 3, 4, 5, 6 or Weghalterolle 24 is arranged.

Fig. 3 shows a further detail of Fig. 1, namely the arrangement of the guide rollers 11, 12 and 13. This arrangement is such that the Good 2 leading run 7 'and 8' of the belt 7, 8, from the linear direction 25 are deflected. The linear direction is symbolized by the dotted line 25. In the illustration, the strands 7 'and 8' are directly adjacent to each other. If a good 2 transported, so this is between the runs 7 'and 8'. Such guide rollers 11, 12 and 13 are particularly useful for ensuring a sufficient holding force, when shortly after a plurality of flat goods 2 are transported, as in the turning device 1 of printing machines 26 (see FIG. 5) is the case.

Fig. 4 shows a further embodiment of the turning device 1 according to the invention in a perspective view. With respect to the identical reference numerals, reference is made to the above description. By the perspective view is visible how the turn of a good 2 in the direction of arrows 17 takes place. In this case, the rear outer edge 16 ', which is at the beginning of the turning device 1, moves upwards, that is to say to the zenith, and the front outer edge 16 is in the racking region 10 at the bottom. Thereafter, the upper outer edge 16 'moves forward and down and the lower outer edge 16 to the rear and above, so that at the end of the turning device 1, the former rear outer edge 16' forward and the former front outer edge 16 is behind.

The helmets 19, 20 and 21 are used to support this turn Guide 19 serves to guide the edge 16 'of the goods 2, said guide 19 on the side 15, at which the outer edge 16 'of the goods 2 upwards moves, and then so forward and towards the end of the turning device 1 extends that the outer edge 16 'to the end position of the goods 2, if this leaves the turning device 1, is guided. It's just the course the guide 19 located, the attachment of the same was for simplicity omitted. It is essential that the guide 19 on the side 15 so extends far to the rear and is fixed so that the attachment the turn of the Good 2 not handicapped.

Another guide 20 serves to ensure that the outer edge 16, which is after the Adjustment range 10 is moved upwards, guided until the good 2 is the end position has reached. In this case, the edge 16 or the adjoining the edge 16 slides Range of goods 2 on the guide 20 until reaching the horizontal Level up.

The third guide 21 serves to cause the edge 16 'towards the end of the turn supports, so that it can not hang down. In this case, this guide 21 so far out that it reaches to the edge 16 '. She became, as the hatched Surface shows cut off so as not to completely cover the lower pulley 4.

The embodiment of Fig. 4 also shows that the pulleys 3, 4, 5 and 6 are each equipped with two retaining collars 14 to a safe leadership as a V-belt to ensure trained belt 7 and 8.

5 shows a printing press 26 with a turning device 1. Such a printing press 26 has an image transfer area 32 in which partial color images are transferred to the printing substrates 2 by means of a plurality of printing modules 27, 27 ', 27 ", 27'". The printing substrates 2 come, for example, from a supply 29 from a storage container, not shown, for printing substrates 2. The printing substrates 2 are guided by a paper path 28. After the image transfer area 32 is in the paper path 28, a switch 30 to give the printing substrates 2 to a boom 31 or re-supplied to the image transfer area 32 for the reverse printing. For this purpose, a paper path 28 leads from the switch 30 back to the image transfer area 32. At this returning paper path 28, a turning device 1 is arranged, which ensures that the printing substrates 2 are turned, whereby now the back of the printing substrates 2, the pressure modules 27, 27 '. , 27 ", 27"'faces and can be printed.

Of course, the embodiments are only a selection of possible realizations the invention. It can also be provided that the goods 2 by means of flat belts 7, 8 is guided or it is possible, two or more parallel running belt 7, 8th to be placed, which take the place of the individually arranged belt 7 and 8 and the then together lead the goods 2, hold and turn. Also, the guide devices 19, 20 and 21 are configured in various ways. It can be around Wires, rails or even surfaces act. Also are different combinations the individual features of the described and illustrated embodiments possible.

LIST OF REFERENCE NUMBERS

1

turning device

2

thin sheet material (printing substrate)

3

upper pulley of the belt 7

4

lower pulley of the belt 7

5

lower pulley of the belt 8

6

upper pulley of the belt 8

7

Belt carrying the goods before turning at the top

7 '

Run of the belt 7 running in the transport direction

7 "

returning strand of the belt 7

8th

Belt that carries the good before turning at the bottom

8th'

Run of the belt 8 running in the transport direction

8th"

returning strand of the belt 8

9

Arrow: transport direction

10

setting region

11

first upper guide roller after the setting area

12

lower guide roller after the setting area

13

second upper guide roller after the Schränkungsbereich

14

retaining collar

15

Side on which the outer edge of the goods after the Schränkungsbereich moved upwards

16, 16 '

outer edges of the goods

16

outer edge, which moves upwards after the setback area

16 '

outer edge, which crosses the zenith and after the Adjustment area moves downwards

17

Arrows: Direction of the turn

18

Guide roller in front of the adjustment area

19

Guide that leads the edge 16 'of the goods

20

Guide that leads the edge 16 of the goods

21

Guiding device that supports edge 16 'towards the end of the turn

22

Holding surfaces of the retaining collars 14th

23

Flanks of the straps

24

path-holding roll

25

linear direction

26

press

27, 27 ', 27 ", 27 '"

pressure modules

28

paper path

29

Feeder from a storage container

30

switch

31

boom

32

Image transfer region

α

Angle of the holding surfaces 22

β

Angular position of the flanks of the belt at the location of the respective roller 3, 4, 5, 6, 11, 12, 13, 18 or 24

Claims (21)

1. Inverter (1) for thin flat products (2), in particular for printing substrates in a printing machine, with belts (7, 8) respectively positioned over two deflection pulleys (3, 4, 5, 6) that are together set at 180° between the deflection pulleys (3, 4, 5, 6), in which case, viewed in transport direction (9), after the setting region (10), at least three guide rolls (11, 12, 13) are mounted on the respective supporting strand sides (7', 8') of belts (7, 8) in alternating arrangement,
   characterized in that,
   in so doing, at least one of the guide rolls (11, 12, 13) is equipped, at least on one side, with a retaining collar (14) guiding a belt (7, 8) at the retaining surface (22) of the retaining collar (14).
2. Inverter according to Claim 1,
   characterized in that
   a retaining collar (14) is situated on the side (15) on which the outer edge (16) of product (2) moves upward after the setting region (10).
3. Inverter according to Claim 2,
   characterized in that
   the second upper guide roll (13) after the setting region (10) has a retaining collar (14).
4. Inverter according to Claim 1, 2 or 3,
   characterized in that,
   after the setting region (10), two upper (11, 13) and one lower guide roll (12) are arranged.
5. Inverter according to one of the Claims 1 through 4,
   characterized in that
   guide rolls (11, 12, 13) lie against the belts (7, 8) so that they are deflected from the linear direction (25).
6. Inverter according to one of the Claims 1 through 5,
   characterized in that
   at least one guide roll (18) is also arranged in or before the setting region (10).
7. Inverter according to Claim 6,
   characterized in that
   the guide roll (18) is mounted under the supporting strand sides (7', 8') of belts (7, 8).
8. Inverter according to one of the Claims 1 through 7,
   characterized in that
   at least one guide device (19, 20, 21) is arranged to guide the product (2) on at least one outer side (16, 16').
9. Inverter according to Claim 8,
   characterized in that
   a guide device (19) is arranged to guide the outer edge (16') that moves downward after the setting region (10).
10. Inverter according to Claim 8 or 9,
    characterized in that
    guide device (19) is configured such that it lifts the outer edge (16') to zenith.
11. Inverter according to one of the Claims 8 through 10,
    characterized in that
    a guide device (20) is provided which lifts the upward moving edge (16) on the horizontal plane toward the end of inversion.
12. Inverter according to one of the Claims 8 through 11,
    characterized in that
    a guide device (21) is arranged that supports the downward moving edge (16') in the horizontal plane toward the end of inversion.
13. Inverter according to one of the Claims 1 through 12,
    characterized in that
    the belts (7, 8) are configured as V belts.
14. Inverter according to one of the Claims 1 through 13,
    characterized in that
    the deflection pulleys (3, 4, 5, 6) are equipped with retaining collars (14) on both sides, at least where they serve as driving rollers.
15. Inverter according to one of the Claims 1 through 14,
    characterized in that
    the retaining collars (14) are freely rotatable relative to rolls (3, 4, 5, 6, 11, 12, 13, 18, 24).
16. Inverter according to one of the Claims 1 through 15,
    characterized in that
    the angles (α) of the retaining surfaces (22) of the retaining collars (14) are adjusted to the angular position (β) for the flanks (23) of the belts (17, 18) at the location of the corresponding roll (3, 4, 5, 6, 11, 12, 13, 18 or 24).
17. Inverter according to one of the Claims 1 through 16,
    characterized in that
    at least one additional path-holding roll (24) is arranged for the belts (7, 8).
18. Inverter according to Claim 16,
    characterized in that
    at least one path-holding roll (24) has retaining collars (14) on both sides.
19. Inverter according to Claim 17 or 18,
    characterized in that
    at least one path-holding roll (24) is arranged on the product-supporting strand sides (7', 8') of the belts (7, 8).
20. Inverter according to Claim 17, 18 or 19,
    characterized in that
    at least one path-holding roll (24) is arranged on the return side (7", 8") of the belts (7, 8).
21. Inverter according to Claim 20,
    characterized in that
    said at least one path-holding roll (24) is arranged such that it prevents a collision of the product (2) with the return sides (7", 8") of the belts (7, 8).

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