EP0607577A2 - Arrangement and method for mounting suction belts in sheet feeders - Google Patents

Abstract

Belt conveyor table of a feeder of a paper sheet processing machine, with at least one through opening in the sheet conveying plane for receiving a rigid frame (7), with at least one conveyor belt (8) guided around the frame (7) so that it can be rotated and with means ( 27) for fastening the frame (7) to a machine-fixed holder, so that the position of the strand of the conveyor belt intended for conveyance is the working position. <IMAGE>

Description

The invention relates to a feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the lay-up stack over an area for lateral alignment to subsequent printing units, and to a method for fastening suction belts in printing machines.

It is known to guide suction belts of suction belt conveying tables for conveying paper sheets from the stacking stack over an area for lateral alignment to subsequent printing units at feeders in sheet-fed printing machines in order to circulate deflection rollers which are individually rotatably mounted on the machine. Usually, the deflection rollers are rotatably supported in different machine-fixed parts due to the larger distances between the deflection rollers due to the length of the conveying path and the devices located between them, which in turn are used at least in part, for example, as receiving bodies for the drawing mark or for similar external functional parts. The individual deflection rollers are each aligned with the body in which they are mounted in relation to the machine. A special precise alignment of the deflection rollers to one another only takes place to a limited extent. In particular, the storage in external functional parts, for example in the body of a drawing mark, first requires the correct alignment of the body with respect to the machine for the functionality of the drawing mark. A precise alignment of the different deflection rollers relative to one another, which is necessary for the belt run and thus for the sheet conveyance, is inevitably often neglected. If it is carried out conditionally, this requires high adjustment effort for the individual deflection rollers already installed in the machine. Because of the machine's inaccessibility, for example due to the spatial narrowness, alignment is additionally difficult. In the case of conversion or adjustment activities, for example the attachment of the side mark or the external function, or other maintenance work outside the actual functional area of the sand, adjustments of the deflection rollers are easily possible. Thus, in the case of a wide variety of maintenance work, a storage of the deflecting rollers that was previously correctly adjusted to one another with a lot of effort would have to be followed by a precise check and, if necessary, a new adjustment with the effort mentioned above.

As a result, not exactly coordinated bearings of the deflecting rollers result in a conveyor belt guided around them not lying in the planned plan of the conveyor plane and being moved. It can partially leave the desired funding level slightly upwards or downwards. An exact, even position and conveyance of the conveyor belt and thus an exact, even sheet conveyance cannot be guaranteed with such a conveyor belt. In the case of suction belts, this can also result in the suction belt leaving its conveying plane, for example the table top or the suction box cover plane, as a result of which incorrect air is sucked in between the suction belt and the suction belt guide plane. The incorrect air escaping to the side of the belt can lead to incorrect behavior in the sheet guide.

In the known belt conveyor tables of feeders of printing machines, the belts are threaded at one end with deflection rollers already installed in the printing machine, threaded through a guide area around the deflection rollers and then finally glued or welded to the other end of the conveyor belt. The welding or gluing point must be completely revised to ensure precise sheet guidance. Neither bulges nor thickening nor other disturbances for the guidance of the belt and thus for the conveyance of the paper sheets may originate from the connection point. Particularly when changing the ribbon during printing in printing plants, this requires a lot of time and precise processing from the operators of the printing press. For processing such belt conveyor tables in the belt run, a complex belt store with a large storage space is usually provided so that the two ends of the belt to be connected can be pulled far enough out of their guide area and connected there to the printing press. For this, high spatial and material expenditure must be carried out.

It is also known to remove sheet braking devices on the delivery arm, in which a short suction band is guided around a plurality of closely spaced deflecting rollers and a short suction area, together with the deflecting rollers from their working position. From DE-PS 41 26 546 it is known to use such a short suction belt, which is only guided via a small suction channel between the closely spaced deflecting rollers, directly in front of the front mark for braking the sheet before the sheet touches the front mark. The short braking process enables the short design. The problems associated with a long design of conveyor belts for conveying the paper sheets from the stacking stack over the feed table with the area for lateral alignment do not arise with the short brake belts.

The invention is based on the problem of creating a functionally reliable conveyor line for conveying paper sheets over the feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the feed stack over an area for lateral alignment to subsequent printing units.

The problem is solved according to the invention by the formation of a belt conveyor table of an investor of a paper sheet processing machine according to the features of claim 1 and by the method for fastening suction belts in printing machines according to the features of claim 12.

The modular design enables the guide rollers to be pre-assembled in a frame outside the paper processing machine. The deflection rollers can thus be precisely aligned with each other independently of the machine within the frame outside the machine. Outside the machine, the conveyor belt can be pulled out over the deflection rollers. The entire frame is then fastened in the machine in the working position of the tape with the tape being pulled up. The frame only has to be attached to the machine in a pre-set position or after alignment. Maintenance or adjustment work on the machine does not affect the mounting of the pulleys in the frame and thus the position of the pulleys relative to one another. Additional adjustment work can be omitted. Secure tape guidance and secure sheet guidance is guaranteed. Such a belt can also be easily changed during operation in print shops. The frame only has to be detached from the machine, the entire module consisting of a frame with deflection rollers mounted therein and the belt which is guided around it is then removed from the working position in the machine. Outside the machine, the tape can be easily pulled off the pulleys. Such a belt conveyor table also enables the use of special belts. For example, training according to the features of claim 10 of such a tape is possible. Such a design of the tape facilitates the error-free assembly of the tape. Gluing or welding work by operators of the machine, for example printers, at the location of the assembly line on the pulleys in print shops is not necessary. The risks associated with a final connection can be avoided. The device according to the invention enables the use of tapes made of non-end-connectable material.

The embodiment according to the feature of claim 11 is advantageous, in which, in particular in the case of suction belts, bulging of the belt transversely to the belt direction can be avoided due to the notch effects of openings which have been punched or otherwise introduced into the belt material.

The design according to the features of claim 2 enables the drive of such a conveyor belt with a machine-fixed drive. The design according to the features of claims 3 represents a simple design of the couplable drive connection. The design according to the features according to the features of claim 4 represents an easy-to-use and easily exchangeable design of a conveyor table with suction belts. Especially with suction belts, the exact alignment of the bearings is essential individual pulleys are particularly desirable. The minimization of the position tolerances enables the suction belt to be guided securely on the suction belt guide level. Incorrect air occurring between the suction belt and the suction belt guide level can be reliably avoided.

The design according to feature 5 enables the advantageous module arrangement of a suction belt while simultaneously using the advantages of suction air sources arranged in a machine-fixed manner.

The formation of the suction air coupling according to the features of claim 6 is particularly advantageous.

The features of claims 7, 8 and 9 represent advantageous embodiments of the suction air coupling.

The underlying problem is also solved by the method according to the features of claim 12. The complete assembly of the suction belt outside the printing machine enables the advantages already mentioned above.

As already described above, the method according to the features of claim 13 improves the ease of installation of suction belts, in particular when replacing suction belts in printing plants.

The training according to the features of claim 1 and the method according to the features of claim 12 also enables the simple insertion of the cheapest ribbon according to the respective print job. With conveyor belts, for example, it is conceivable to adapt the roughness of the conveyor belts to the corresponding conveying requirements easily and quickly by exchanging the belt. With suction belts, it is also easy to convert the suction belts of different types of holes. Thin sheets of paper can be transported with small holes, heavy cartons with large holes. The shape of the holes, the number and density of the holes can also be individually adjusted from print job to print job. The change can be carried out easily, quickly and safely on site in print shops.

The invention is explained in more detail below with reference to exemplary embodiments shown in FIGS. 1 to 14.

Fig. 1

schematische übersichtsdarstellung einer Saugbandfördereinrichtung im Anleger einer Bogenrotationsdruckmaschine,

Fig. 2

einen erfindungsgemäßen Saugbandzuführtisch in Draufsicht,

Fig. 3

die Ausführungsform von Fig. 2 in Schnittdarstellung gemäß Schnitt II-II von Fig. 2,

Fig. 4

das Ausführungsbeispiel von Fig. 2 gemäß dem Schnitt IV-IV von Fig. 3

Fig. 5

ein weiteres Ausführungsbeispiel in Draufsicht,

Fig. 6

das Ausführungsbeispiel von Fig. 5 in Schnittdarstellung gemäß VI-VI von Fig. 5,

Fig. 7

Ausführungsbeispiel von Fig. 5 gemäß der Schnittdarstellung VII-VII von Fig. 6,

Fig. 8

weiteres Ausführungsbeispiel in Draufsicht,

Fig. 9

Seitenansicht gemäß Schnitt IX-IX von Fig. 8,

Fig. 10

Ausführungsbeispiel von Fig. 8 gemäß Schnitt X-X von Fig. 9,

Fig. 11

Detaildarstellung der Dichtung des Ausführungsbeispiels von Fig. 9 in vergrößertem Maßstab,

Fig. 12

Ausführungsbeispiel einer Antriebsverbindung in

Fig. 13

weiteres Ausführungsbeispiel einer Antriebsverbindung,

Fig. 14

zwei schematisch dargestellte Beispiele zur möglichen Bandspannung.

Show here:

Fig. 1

schematic overview of a suction belt conveyor in the feeder of a sheet-fed rotary printing press,

Fig. 2

a suction belt feed table according to the invention in plan view,

Fig. 3

2 shows the embodiment of FIG. 2 in a sectional view according to section II-II of FIG. 2,

Fig. 4

the embodiment of FIG. 2 according to section IV-IV of FIG. 3rd

Fig. 5

another embodiment in plan view,

Fig. 6

5 in a sectional view according to VI-VI of FIG. 5,

Fig. 7

5 according to the sectional view VII-VII of FIG. 6,

Fig. 8

another embodiment in plan view,

Fig. 9

Side view according to section IX-IX of Fig. 8,

Fig. 10

8 according to section XX of FIG. 9,

Fig. 11

Detailed view of the seal of the embodiment of FIG. 9 on an enlarged scale,

Fig. 12

Embodiment of a drive connection in

Fig. 13

another embodiment of a drive connection,

Fig. 14

two schematically illustrated examples of possible belt tension.

Fig. 1 shows schematically a feed table of a sheet-fed offset printing press, in which paper sheets are conveyed in a known manner from a feed stack 1 onto the feed table. A suction belt conveyor 6 is provided in the feed table, which holds the paper sheet in a known manner by sucking the underside of the sheet onto the suction belts and by moving the suction belts on side marks 3, on which the paper sheets are aligned along their side edge, up to front marks 4, on which the paper sheets are conveyed aligned along their leading edge. In a known manner, not shown, the aligned paper sheets are transferred to subsequent cylinders 5 of a printing unit.

2 to 4 show an embodiment of such a suction belt conveyor 6, in which 7 deflection rollers 8 and 9 are rotatably mounted parallel to each other in a frame. In frame 7, two suction boxes 12 and 13 are attached. The suction boxes 12 and 13 each consist of a box 14 and 15 open at the top and are covered on their upper side by a cover plate 16 and 17 fastened thereon. Holes 18 are regularly distributed in the cover plates 16 and 17. Around the deflection rollers 8 and 9, a suction belt 10 is guided continuously, which rests with its upper run on the flat machined cover plates 16 and 17. In the side walls of the frame, opening channels 19 and 20 are guided continuously to the outside on both sides of the suction box 12 and 13, respectively, transversely to the sheet conveying direction.

The frame with suction boxes 12, 13 and deflection rollers 8, 9 is completely preassembled, the suction belt outside the printing machine has already been pulled on. Thereafter, the frame 7 on a below the sheet conveying plane on a transverse to the sheet conveying Ouertraversen 25, which are fixed in the machine side frame, extending in the sheet conveying direction extending longitudinal beam 24 with the help of Screws 27 attached. When lowering the frame 7 before fastening into the niche provided for this purpose in the feed table, a sealing connection connection is created between opening channels 19 and 20 in the frame which run transversely to the sheet conveying direction and corresponding suction channels 22 provided in brackets 31, 32 for the table tops 11 laterally leading away from the frame The sealing effect is achieved by seals 30 around the opening area of the suction channel 22. The suction channels 22 lead below the cross members 25 into a common suction channel 29 to the suction air source, not shown.

The already completely pre-assembled suction box module in this way, consisting of frame 7 deflecting rollers 8, 9 suction boxes 12, 13 and suction belt 10 can be made ready for use exactly outside the table area unaffected by adjustment processes in the table. The complete suction box module can be made operational in a very short time by simply inserting the suction box module into the table niche provided and by fastening the frame 7 with the screws 27. From the suction air source, not shown, the suction boxes 13 and 14 via the suction channel 29, the suction channels 22 and 21 and the opening channels 19 and 20 are subjected to negative pressure. Through the openings 18 in the cover plates 16 and 17 and through the holes 26 of the suction belt, paper sheets lying on the suction belt can be conveyed exactly by moving the suction belt. To change the suction belt or to use a different suction box with other openings depending on the individually desired suction and delivery behavior depending on the respective print job, it is possible to remove the frame 7 and thus the complete suction box module from the by simply and quickly loosening the screws 27 To loosen and remove the position in the table, to replace it outside the table with a completely new module, for example with other cover plates 17 or with a different type of belt. Also on same module with simple means outside the table, the suction belt 10 used can be quickly replaced.

To remove or also to facilitate insertion of the module into the desired position in the table, it is possible to provide additional pulling threads 28 in the frame 7. By simply screwing screw hooks into the pulling thread 28 before removing the suction module from its working position in the table, the complete suction module is thus easy to handle. After inserting a suction module, they are unscrewed and removed before the sheet feed begins.

Figures 5 to 7 show a further embodiment of such a suction belt conveyor. From the suction boxes 12 and 13 in the frame 7, the opening channels 19 and 20 leading laterally out of the suction box are deflected downwards in the frame 7. When the frame 7 is fastened on the longitudinal cross member 24, its outlet openings come out of the frame 7 in sealing contact with corresponding suction ducts 36 pointing upwards. These in turn open into a common suction duct 29, as shown in the exemplary embodiment in FIGS a suction air source, not shown, opens out. The corresponding openings of the suction channels 34, 36 or 33 and 35, which run perpendicular to the direction of insertion of the frame, namely perpendicularly downward towards the longitudinal cross member, enable the suction air connection between frame 7 and suction air source to be sealed in a particularly simple manner. For this purpose, it is sufficient to fasten simple sealing disks 37 or O-rings between the suction air duct 36 and the opening duct 34 or the suction air duct 35 and the opening duct 33 in the connection area. In this way, the suction box module is sealed in the niche provided in the table by simply tightening the screws 27 on the longitudinal cross member 24.

8 to 11, a suction belt conveying direction is shown, in which the suction air is supplied from a suction air source, not shown, via a suction channel 29 and suction channels 42, 43 connected to it, which pass through from below through the longitudinal cross member 24. The suction air passes from the suction channels 42, 43 via the lower run of the suction belt 10 and openings 38 and 39 in the bottom of the boxes 14 and 15 of the suction boxes 12 and 13 into the interior of the suction box. Seals 40 and 41 extending transversely to the belt conveying direction are provided for sealing, as shown in FIGS. 9 and 11. A seal 40 is fastened on both sides in front of and behind the opening 45 or in front of and behind the opening 39 below the boxes 15 and 14 above the lower run of the suction belt in the frame 7. On the longitudinal cross member 24, a seal 41 extending transversely to the belt conveying direction is fastened in front of and behind the opening of the suction channel 42 and the suction channel 43 in the belt conveying direction. The seals 40 and 41 are provided with two V-shaped sealing lips 44 and 45 which are spread apart upwards or downwards. The sealing lips are of a known type and can be provided, for example, from the material PTFE. The sealing lips are arranged in such a way that when the suction box module is attached to the longitudinal crossmember between the suction boxes and the suction belt, a sealing effect is created with the aid of the seals 40, and a sealing effect also arises between the suction belt and the longitudinal crossbar 24. A sealing lip 44 and a sealing lip 45 are arranged one above the other. The sealing lips are oriented in the direction of the strand movement direction.

As shown in FIG. 12, it is possible to provide the deflection roller 8 mounted in the frame 7 for driving the suction belt with a gearwheel 46 which, when the suction belt module is introduced from above into the niche provided in the The contact table comes into meshing contact with a gearwheel 23 which is fastened to a drive shaft connected to the machine drive and mounted, for example, in the position 31 of the table or in the machine side frames.

It is also conceivable to provide a dog clutch according to the embodiment of FIG. 13 instead of this gear connection. A driving claw 47 is fastened on the shaft of the deflection roller 8. When the suction box module is arranged in the niche provided in the feed table, the claw 47 comes into drive connection with a corresponding drive claw 48 of a drive shaft mounted in the machine side frame or in a holder 31 of the table top.

In the above-mentioned exemplary embodiments, it is possible to easily change a suction belt 10 outside the feed table. It is also possible to lift an elastic suction band 10 against its elastic forces against the deflection rollers 8 and 9 after expansion and to replace it in the same way with a new elastic band. The elastic tensioning force of the belt creates the holding tension on the deflection rollers 8 and 9. For assembly and disassembly, the belt is pulled apart somewhat against the tensioning forces. It is also conceivable, as shown in FIG. 14 b, for example, to rotatably mount a deflection roller 49 in the frame 7 in order to reduce the clamping force to be applied by the assembler. A further deflection roller 50 can be rotatably mounted in the longitudinal cross member 24. By introducing the suction belt module into the table niche provided, the deflection roller 49 acting on the inside of the suction belt and the deflection roller 50 acting on the suction belt from the outside form a tensioning device, so that the web tension required for belt conveyance is only introduced into the intended position in the table niche when the suction belt module is introduced is produced. The assembly or disassembly of the suction belt can be simplified by such a device. Both described suction belt modules, it is also possible to move an end-connectable suction belt in a known manner, but simply outside the feed table around the deflection rollers and to glue or weld its ends and then to connect and rework the joints at the best processing location . However, it is also conceivable for such a device to directly clamp and revise previously connected suction belts. It is also conceivable to use suction belts that are already manufactured. In particular, it is conceivable, for example, to use ribbons knitted all around in the application area of a sheet-fed offset printing press.

REFERENCE SIGN LIST

1

Docking pile

2nd

Feed table

3rd

Side mark

4th

Front mark

5

cylinder

6

Suction belt conveying direction

7

frame

8th

Pulley

9

Pulley

10th

Suction belt

11

Table top

12th

Suction box

13

Suction box

14

box

15

box

16

17th

Cover plate

18th

hole

19th

Opening channel

20th

Opening channel

21

Suction channel

22

Suction channel

23

gear

24th

Longitudinal beam

25th

Crossbar

26

hole

27

screw

28

Pull-off thread

29

Suction channel

30th

poetry

31

bracket

32

bracket

33

Opening channel

34

Opening channel

35

Suction channel

36

Suction channel

37

poetry

38

opening

39

opening

40

poetry

41

poetry

42

Suction channel

43

Suction channel

44

Sealing lip

45

Sealing lip

46

gear

47

claw

48

claw

49

Pulley

50

Pulley

Claims (13)

Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack, over an area for lateral alignment to subsequent printing units, - With at least one through opening in the sheet conveying plane, which extends over the lateral alignment area in the conveying direction, for receiving a rigid frame (7), - With one or more to around in the frame (7) rotatably mounted deflection rollers (8, 9) guided conveyor belt (10) for conveying the paper sheets from the beginning of the feed table to beyond the lateral alignment area and and - With means (27) for fastening the frame (7) to a machine-fixed bracket, so that the position of the strand of the conveyor belt (10) intended for conveyance is the conveying position. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 1, - In the case of a deflection roller of a conveyor belt (10) mounted in the frame (7) there is a detachable drive connection from a driven shaft mounted in the machine side frames. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 2, - With means for independent coupling when attaching the frame (7) to the machine-fixed bracket and - With means for independent decoupling when removing the frame (7) from the machine-fixed bracket. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 1, - in which the conveyor belt (10) is provided with uniformly distributed through openings (26), - In which at least one suction box (12, 13) is fixed in the frame (7) between the upper and lower run of the conveyor belt (10) and - Through openings (18) are provided in the suction box (12, 13) in the direction of the run intended for conveyance. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the feed stack over an area for lateral alignment to subsequent printing units according to the features of claim 4,
with a detachable suction air connection to a machine-fixed suction air source. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the lay-up stack over an area for lateral alignment to subsequent printing units according to the features of claim 5, - With a sealing suction air coupling, which is fixed to the machine when arranging the frame (7) Coupled bracket and uncoupled from the machine-fixed bracket when removing the frame (7). Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 6, - With a suction air connection opening in the frame (7) and a corresponding suction air connection opening on a machine-fixed bracket (31, 32), the opening planes of the corresponding openings being parallel to one another and at least almost parallel to the direction of movement of the frame (7) in its working position. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 6, - With a suction port opening in the frame (7) and a corresponding suction port on a machine-fixed bracket (24), the opening planes of the corresponding openings being parallel to each other and at least almost perpendicular to the direction of movement of the frame (7) in its working position. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 6, - With a frame-fixed suction air connection (39) from the suction box (12, 13) to the inside of the non-conveying strand and - With a corresponding machine-fixed suction air connection (43) to the outside of the non-conveying strand. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 1,
in which the conveyor belt (10) is a circumferentially prefabricated elastic belt. Feed table of a sheet-fed printing machine with conveyor belts for conveying paper sheets from the stack of sheets over an area for lateral alignment to subsequent printing units according to the features of claim 10,
in which the band consists of elastic, continuously knitted fabric. Process for fastening revolving suction conveyor belts in printing machines,
in which the suction belt (10) is first mounted on a suction box module with deflection rollers (8, 9) stored in it outside of its working position in the printing machine and the suction box module is then brought together with the suction belt mounted thereon into the intended working position in the printing machine and fastened there . Method for fastening suction conveyor belts in printing machines according to the features of claim 12, - In which an elastic all-round suction belt (10) is mounted on the suction box module.

Images