EP1170238A2 - 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 flat material, in particular for printing substrates in a printing machine, each with more than two Deflection belts placed belts that together between the deflection rollers by 180 ° are restricted.

Such turning devices are particularly suitable for handling printing substrates known, for example in printing machines. In these are with a such a turning device turned the printing substrates for double-sided printing. However, other applications are also conceivable, for example in further processing the printing substrates after printing.

A turning device of the type mentioned at the outset is known from DE 29 07 110 C2 known. It is the turning device of a folding machine. The The problem with such turning devices is an exact transport of the Good, which should be positioned as exactly as possible after the turn. This is especially for turning devices in printing presses that are set up for reprinting are an essential requirement for print quality. This should be avoided become that the good loses its orientation. Therefore, the good between the Belts are held securely and it must be ensured that the straps are secure not by transverse forces, especially as a result of the transport of goods from their target position move.

A turning device for X-ray film sheets is known from DE 24 44 697 A1, which is equipped with transport rollers. These ensure that the x-ray film sheets due to the alternating attachment of the transport rollers with sufficient holding force are acted upon. However, the X-ray film sheets are completely between the Conveyor belts and these are in the embodiment with the turn on one Side connected because the two conveyor belts by folding one in the middle Fabric web arise. In this way, lateral forces cannot be exerted on the conveyor belts in this way act that these by the transverse forces from their target position, in particular can move out their mutual relative position. With a turning device However, the conveyor belts cannot be of the type mentioned at the beginning be connected to each other because the goods to be transported are at the point of convergence the circumferential belt is picked up and at the point of diverging the belt leaves the turning device again.

The invention is therefore based on the object of a turning device at the beginning mentioned type in such a way that the goods and the straps are exactly in their Move target positions.

The object is achieved in that seen in the direction of transport After the setting area, at least three guide rollers on the supporting strands the straps are arranged in an alternating arrangement and at least one of the Guide rollers has a retaining collar on at least one side.

The measure according to the invention makes the goods safe between the goods being transported serving strands held by the strap, the at least one retaining collar is attached to one or more guide rollers to the barrel and the Stabilize the belt holding force also between the pulleys. It is expedient to attach the retaining collar on the side of the rollers, on the side with transverse forces must be expected, which deflect one or both belts laterally can. Especially when a turning device bigger, heavier flat goods with a large projection over the belts at high speed, at least one such collar is required. These requirements exist especially with the turning devices of printing machines.

Further developments of the invention serve to optimize the precision of the turn of the Good by applying holding forces, where these hold the goods securely are necessary and absorb transverse forces where these occur.

An embodiment of the invention provides that there is a retaining collar on the side is located on which the outer edge of the goods after the setting area moved up. It expediently has the second upper guide roller after the Setting area on a retaining collar, because there the greatest lateral force by the Oblique position of the goods occurs. As a rule, it is sufficient if after the setting area two upper and one lower guide roller are arranged.

So that the material is held between the belts with sufficient forces proposed that the guide rollers bear against the belt in such a way that they come out of the linear direction are deflected.

In addition to the guide rollers after the setting area, it can also be provided that that at least one guide roller is arranged in or in front of the setting area. It is conveniently a leading role among the main strands of the Straps arranged to ensure a smooth running of the straps and a certain pressure to ensure for the good. The straps can also sag in this way be avoided due to the weight of the goods.

If a good is to be turned that protrudes beyond the belt to a greater extent, such as this is normally the case with printing substrates, it is also advisable if at least one guide device is arranged, which the goods on at least one Outside leads. So can be a guide for guiding the outer edge, the moves downward after the setting area. This is Especially useful for harder, stiffer papers or similar goods this at the end of the turning device reliably the level for further transport to reach. A guide device can also be designed such that it the outer Raises edge to the zenith of the turn. This is particularly the case with flexible papers expedient, so that this despite the tendency to bend safely and in time for can be brought to the other side. The latter two control systems are expediently designed as a continuous guardrail, for example in Form of a stable wire that is bent according to the movement of the goods and is arranged.

For the edge of the good that moves down, then after the turn to be raised back to the horizontal level, it is useful if one Guide device is provided which moves upwards towards the end of the turn Raises the border to the horizontal level. Furthermore, there should be a guidance system be arranged, the moving towards the end of the turn down Supports in the horizontal plane. It is the edge that passes through goes to the zenith, and it shouldn't move below the horizontal plane so that Can be transported safely.

The guide devices can be designed in a wide variety of ways. For example, the latter two can be designed accordingly Act sliding surfaces. However, other configurations are of course also possible conceivable.

Various types of belts can be used as belts. It can are flat belts, also flat belts with a wider configuration, or it is it is also possible to provide several belts running in parallel. A preferred embodiment however, provides that the belts are designed as V-belts, since these have a high stability. At least for the latter proposal it is expedient if the deflection rollers at least where they serve as drive rollers, are equipped with double-sided retaining collars. This ensures high power transmission possible. Both the deflection rollers and other rollers can be designed in this way be that the retaining collars are designed to rotate freely with respect to the rollers. To this In this way, the straps can be guided without one in the area of the retaining collars increased friction between the same and the belt occur. This will make the Wear kept low.

Because the belts deform due to the setting, 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 retaining collars to the angular position of the flanks of the straps at the location of the 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 deflection rollers 25 ° and by setting the V-belts in different areas of the Turning device the flanks had an angle of 34 °. That fact taken into account in the design of the holding surfaces of the holding collars, so it happens a clean attachment of the straps to these holding surfaces and thereby to one clean, precise and wear-free running of the belts.

In addition to the aforementioned roles, one or more additional holding rollers can also be used be arranged for the straps. In order to guide the straps well, it is included useful if one or more holding rollers have retaining collars on both sides. It can be provided that at least one holding roller to which the good leading strands of the straps are arranged, or if one or more holding rollers the straps are arranged on the returning strands. In the latter case the at least one path holding roller can be arranged such that it causes 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 is 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 perspective view

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 to the turning device 1 in the direction of the arrow 9. The transport and the turn take place by means of two belts 7, 8, which are assigned to each other in such a way that two runs 7 'and 8' run in the direction of arrow 9 and thereby transport the thin, flat material 2. The straps 7 and 8 are set in such a way that the strand 7 'is at the top and the strand 8' is at the bottom and in front of the setting region 10 the strand 8 'is at the top and the strand 7' is at the bottom. By means of this setting of the belts 7 and 8, the material 2 held between the runs 7 'and 8' is turned by 180 °, so that after the turn the two outer edges 16, 16 '(see FIG. 4) are interchanged and the previous bottom is located above.

The belts 7 and 8 are supported by pulleys 3, 4, 5 and 6. The Belt 7 carried by an upper pulley 3 and a lower pulley 4. Between the underside of the deflection roller 3 and the top of the deflection roller 4 runs the strand 7 'leading the material 2 and from the underside of the deflection roller 4 to The returning strand 7 ″ runs on the top of the deflection roller 3 from the lower pulley 5 above to the upper pulley 6 below the goods 2 leading strand 8 'of the belt 8 and from the top of the guide roller 6 to the bottom the pulley 5, the return strand 8 "of the belt 8. It goes without saying Measures required to prevent the returning runs 7 "and 8" rub against each other or against the leading strands 7 'and 8'. For example, for this serve a slight inclination of the pulleys 3, 4, 5 and 6. You can too this purpose, holding rollers 24 are used, which are expediently two Have retaining collars 14 and, for example, a return strand 8 "to the front and deflect the other returning strand 7 "backwards. It became an example only one holding roller 24 is drawn in, it can of course be used on all Runs 7 ', 7 ", 8', 8" one or more holding rollers 24 may be provided.

Since the problem with such a turn is that goods 2 are held securely must be and remain aligned parallel to the direction of transport 9 in the turn it is proposed that at least three guide rollers 11, 12 and 13 are arranged after the setting area 10. The guide rollers 11, 12, 13 alternately arranged on the strands 7 'and 8' so that they the straps 7 and 8 deflect to a small 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 material 2 acts on the belts 7 and 8 with transverse forces proposed at least one of the guide rollers 11, 12, 13 with at least one Equip retaining collar 14. The guide rollers 11, 12, 13 are preferably such arranged that there are two guide rollers 11 and 13 in the upper area and a lower guide roller 12 is arranged between them. The second upper guide role 13 is equipped with a holding collar 14 in the rear area, that is to say on the side 15 (see Fig. 4), on which the outer edge 16 of a good 2 after the setting area 10 moved up. This ensures that the absolute Positioning and the mutual relative positions of the runs 7 'and 8' are obtained remain and thus also the positioning of the thin flat material 2.

Fig. 2 shows a detail of Fig. 1, namely the guide roller 13 with the retaining collar 14. It must be noted at the angle α of the holding surface 22 of the retaining collar 14 that this with the angular position β of the flanks 23 of the belt 7, 8, the these on the guide roller 13, coincides. 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 holding surfaces 22 of the guide roller 13 or another roller 3, 4, 5, 6, 11, 12, 13, 18, 24, which is equipped with a holding collar 14, must be different and the respective angle β Flanks 23 of the belts 7, 8 correspond, depending on the point at which a belt 7 or 8 such a guide roller 11, 12, 13, 18 or a deflecting 3, 4, 5, 6 or holding roller 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 material 2 leading strands 7 'and 8' of the belt 7, 8, from the linear direction 25 are deflected. The linear direction is symbolized by the dash-dotted line 25. In the illustration, the runs 7 'and 8' lie directly against one another. If a good 2 is transported, it is located between the runs 7 'and 8'. Such guide rollers 11, 12 and 13 are particularly useful to ensure a sufficient holding force when several flat goods 2 are transported in quick succession, as is the case with the turning device 1 of printing presses 26 (see FIG. 5).

4 shows a further exemplary embodiment of the turning device 1 according to the invention in a perspective view. With regard to the identical reference symbols, reference is made to the above description. The perspective representation shows how the turning of a good 2 takes place in the direction of the arrows 17. In this case, the rear outer edge 16 ′ at the beginning of the turning device 1 moves upward, that is to the zenith, and the front outer edge 16 is in the setting area 10 at the bottom. Then the upper outer edge 16 'moves forwards and downwards and the lower outer edge 16 backwards and upwards, so that at the end of the turning device 1 the previously rear outer edge 16' is at the front and the formerly front outer edge 16 is at the rear.

Guides 19, 20 and 21 serve to support this phrase Guide device 19 serves to guide the edge 16 'of the goods 2, this guide device 19 on the side 15, on which the outer edge 16 'of the goods 2 upwards moves, begins and then moves forward and towards the end of the turning device 1 extends that the outer edge 16 'to the end position of the goods 2 when this leaves the turning device 1, is guided. It is only the course the guide 19 is shown, the attachment of the same has been simplified omitted. It is essential that the guide device 19 so on the side 15 extends far to the rear and is attached such that the attachment is the turn of Good 2 not hindered.

Another guide device 20 serves that the outer edge 16, which is after the The setting area 10 moves upwards, is guided until the material 2 reaches the end position has reached. The edge 16 or the one adjoining the edge 16 slides Area of the goods 2 on the guide device 20 until reaching the horizontal Level up.

The third guide device 21 is used so that it the edge 16 'towards the end of the turn supports so that it can not hang down. This guide device 21 goes so far outwards that it extends to the edge 16 '. It became like the hatched Surface shows, cut off so as not to completely cover the lower deflection roller 4.

The embodiment of FIG. 4 also shows that the deflection rollers 3, 4, 5 and 6th are each equipped with two retaining collars 14 in order to safely guide them as V-belts trained belts 7 and 8 to ensure.

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 feed 29 from a storage container for printing substrates 2, not shown. The printing substrates 2 are guided by a paper path 28. After the image transfer area 32 there is a switch 30 in the paper path 28 in order to give the printing substrates 2 to a delivery arm 31 or to feed them again to the image transfer area 32 for the back printing. For this purpose, a paper path 28 leads from the switch 30 back to the image transfer area 32. A reversing device 1 is arranged on this returning paper path 28, which ensures that the printing substrates 2 are turned, so that the back of the printing substrates 2 is now the printing modules 27, 27 ' , 27 ", 27"'facing and can be printed.

Of course, the exemplary embodiments are only a selection of possible implementations the invention. It can also be provided that the material 2 by means of flat belts 7, 8 or it is possible to have two or more belts 7, 8 running in parallel to arrange, which take the place of individually arranged belts 7 and 8 and then lead, hold and turn goods 2 together. The guidance systems can also 19, 20 and 21 can be designed in various ways. It can be Trade wires, rails or surfaces. There are also various combinations of the individual features of the described and the illustrated embodiments possible.

LIST OF REFERENCE NUMBERS

1

turning device

2

thin flat material (printing substrate)

3

upper pulley of belt 7

4

lower pulley of belt 7

5

lower pulley of belt 8

6

upper pulley of belt 8

7

Belt that carries the goods on the top before the turn

7 '

The belt 7 runs in the transport direction

7 "

returning run of belt 7

8th

Belt that carries the goods on the underside before the turn

8th'

The belt 8 runs in the transport direction

8th"

returning belt 8

9

Arrow: direction of transport

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 setting area

14

retaining collar

15

Side on which the outer edge of the good after the setting area moved up

16, 16 '

outer edges of the good

16

outer edge that moves upwards after the setting area

16 '

outer edge, which passes through the zenith and after the Set area moved down

17

Arrows: direction of turn

18

Leading role in front of the setting area

19

Guide device which guides the edge 16 'of the goods

20

Guide device that guides the edge 16 of the goods

21

Guide device which supports the edge 16 'towards the end of the turn

22

Retaining surfaces of the retaining collars 14

23

Flanks of the straps

24

path-holding roll

25

linear direction

26

press

27, 27 ', 27 ", 27 '"

pressure modules

28

paper path

29

Feeding 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 belts at the location of the respective roller 3, 4, 5, 6, 11, 12, 13, 18 or 24

Claims (21)

Turning device (1) for thin flat material (2), in particular for printing substrates in a printing machine, with belts (7, 8) placed over each of two deflecting rollers (3, 4, 5, 6), which between the deflecting rollers (3, 4 , 5, 6) are limited together by 180 °,
characterized in that, seen in the transport direction (9) after the setting area (10), at least three guide rollers (11, 12, 13) are attached to the supporting strands (7 ', 8') of the belts (7, 8) in an alternating arrangement and at least one of the guide rollers (11, 12, 13) has a retaining collar (14) on at least one side. Turning device according to claim 1,
characterized in that there is a holding collar (14) on the side (15) on which the outer edge (16) of the material (2) moves upward after the setting area (10). Turning device according to claim 2,
characterized in that the second upper guide roller (13) has a holding collar (14) after the setting area (10). Turning device according to claim 1, 2 or 3,
characterized in that two upper (11, 13) and one lower guide roller (12) are arranged after the setting area (10). Turning device according to one of claims 1 to 4,
characterized in that the guide rollers (11, 12, 13) bear against the belts (7, 8) in such a way that they are deflected from the linear direction (25). Turning device according to one of claims 1 to 5,
characterized in that at least one guide roller (18) is also arranged in or in front of the setting area (10). Turning device according to claim 6,
characterized in that the guide roller (18) is arranged under the supporting strands (7 ', 8') of the belts (7, 8). Turning device according to one of claims 1 to 7,
characterized in that at least one guide device (19, 20, 21) is arranged which guides the material (2) on at least one outer side (16, 16 '). Turning device according to claim 8,
characterized in that a guide device (19) for guiding the outer edge (16 '), which moves downward after the setting area (10), is arranged. Turning device according to claim 8 or 9,
characterized in that a guide device (19) is designed such that it raises the outer edge (16 ') to the zenith. Turning device according to one of claims 8 to 10,
characterized in that a guide device (20) is provided which lifts the edge (16) moving upwards towards the end of the turn onto the horizontal plane. Turning device according to one of claims 8 to 11,
characterized in that a guide device (21) is arranged which supports the edge (16 ') moving downwards towards the end of the turn in the horizontal plane. Turning device according to one of claims 1 to 12,
characterized in that the belts (7, 8) are designed as V-belts. Turning device according to one of claims 1 to 13,
characterized in that the deflecting rollers (3, 4, 5, 6) are equipped with retaining collars (14) on both sides at least where they serve as drive rollers. Turning device according to one of claims 1 to 14,
characterized in that retaining collars (14) are designed to rotate freely relative to rollers (3, 4, 5, 6, 11, 12, 13, 18, 24). Turning device according to one of claims 1 to 15,
characterized in that the angles (α) of the holding surfaces (22) of the holding collars (14) to the angular position (β) of the flanks (23) of the belts (17, 18) at the location of the respective roller (3, 4, 5, 6 , 11, 12, 13, 18 or 24) are adapted. Turning device according to one of claims 1 to 16,
characterized in that at least one additional holding roller (24) for the belts (7, 8) is arranged. Turning device according to claim 16,
characterized in that the at least one holding roller (24) has retaining collars (14) on both sides. Turning device according to claim 17 or 18,
characterized in that at least one holding roller (24) is arranged on the well-guiding runs (7 ', 8') of the belts (7, 8). Turning device according to claim 17, 18 or 19,
characterized in that at least one displacement roller (24) is arranged on the returning strands (7 ", 8") of the belts (7, 8). Turning device according to claim 20,
characterized in that the at least one holding roller (24) is arranged in such a way that it prevents the goods (2) from colliding with the returning strands (7 ", 8") of the belts (7, 8).

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