EP1006068B1 - Delivery device of a sheet processing machine - Google Patents

Abstract

The sheet (3) printing machine has a boom with circulating grippers (9.1) which draw sheets along a conveyor section forming a sheet deflection area (24). A blown air source forms a blown air curtain crossways to the conveyor section. This curtain activates sheets passing through the deflection area. During activation of the sheets passing through the deflection area the blown air curtain passes through the deflection area in the same direction as the grippers.

Description

The invention relates to a boom of a sheet-processing machine, in particular a printing press, with rows of grippers, which pull the sheet operatively along a conveyor line, endless conveyor chains, which pass through the boom operatively in a circumferential direction and carry the gripper rows, a pair about a common axis of rotation rotatable sprockets which are in engagement with the conveyor chains and form a deflection region of the conveyor line and with a Blasluftquelle which ejects a Blasluftvorhang, by means of which the Bogenumlenkbereich passing arc at its side facing the axis of rotation can be acted upon.

Such a boom is known for example from the document US 5,456,178. This discloses an air curtain ejected from a blowpipe assembly that is aligned with an environment of a transfer region in which a respective one of the looper rows accepts a respective one of the sheets from a cylinder leading them. Leaves the trailing end of each sheet this transfer area, so the bow can from this end - d. H. in sheet travel direction - be under blown. However, this has a very unfavorable effect on a smooth course of the bow. In DE-A-39 39 209 a respective arc is continuously applied to a blown air curtain when passing through a deflection sprocket formed by a drive sprocket. Document US Pat. No. 5,626,075 discloses a fan arranged within a deflection region which ejects blowing air substantially radially over the entire circumference of an imaginary cylindrical envelope surface.

In relatively rigid bow - especially in cardboard - the known blowpiped does not provide the desired effect to prevent an arbitrary striking the sheet of machine parts. Such a bow would rather collide with the known Blasrohranordnung.

From the document DE-AS 20 17 417 a populated with a gripper row drum is known, the gripper row takes over a sheet of a printing cylinder of a printing unit and passes to a next printing unit of a rotary printing machine in a row construction. For unspecified reasons, this drum has a jacket which supports the sheet only along a part of its extent in the circumferential direction of the drum. In a space covered by sheet space between the arc supporting the mantle and the gripper row a bow supporting the sheet is provided pneumatically supporting. According to one embodiment, this support means comprises a blowing tube parallel to the drum axis, which is arranged close to an enveloping circle applied to the drum, with respect to the drum axis radially outwardly directed exhaust openings and rotates with the drum. With this support means the purpose is pursued to prevent the emergence of a rubber blanket cylinder of each of the printing units resting curl in the sheet when it leaves the printing nip and thus counteract Passerdifferenzen.

In a boom as mentioned above, the problem does not occur in connection with the avoidance of Passerdifferenzen. Instead, the general problem here is to transfer printed sheets to a sheet feeder without smearing and to combine them into a stack. One of the operations to be performed in this context is a smooth running of the bows.

The invention has the object of providing a boom of the type mentioned in such a way that unfavorable influences on the part of the Blasluftvorhanges is counteracted to a smooth running of the Bogenumlenkbereich passing arc.

To solve this problem it is provided that during the loading of the Bogenumlenkbereich passing arc with the Blasluftvorhang this in turn happened the Bogenumlenkbereich in the same sense as the conveyor chains.

With such a design of a cantilever, in particular the above-described underblowing of the trailing region of the respective arch is avoided. The reason for this is that in particular although not absolutely necessary but - as explained later - advantageously provided complete conformity of the angular velocities on the one hand the Bogenumlenkbereich passing gripper and the other hand the Bogenumlenkbereich passing Blasluftvorhanges its relative position to the grippers and thus to that of this drawn arc within the Bogenumlenkbereiches not changed.

An advantageous embodiment provides that the blowing direction of the Blasluftvorhanges the direction of the Bogenumlenkbereich passing arc tends to be opposite, so that the blowing direction has one of the direction of the deflection region passing conveyor chains opposing component. This allows for a preferably provided impingement of the Blasluftvorhanges in a pulling a sheet gripper immediately adjacent region of this arc an admission of the same with blowing air over almost its entire extent in the direction of the arc without the Blasluftvorhang already before hitting the bow the extension of the same in the direction of travel must have largely corresponding extent. Accordingly small so the Blasluftquelle can be formed so that they can be conveniently formed by means of only one arranged transversely to the aforementioned direction nozzle row.

In further preferred embodiments, it is provided that the blowing direction of the Blasluftvorhanges is adjustable, that the Blasluftvorhang the Bogenumlenkbereich happens at an adjustable distance to the conveyor line, and that the Blasluftvorhang the Bogenumlenkbereich happens in an adjustable phase angle to the grippers.

Using at least one of these conditions or even a combination of the same with at least one other succeeds an adjustment of the Bogenumlenkbereich passing arc supporting effect on a relatively wide range of basis weights and stiffness of the sheet, as well as to different formats thereof, without the Blasluftvorhang respect to his pneumatic parameter needs to be modified. Thus, the effort required to produce the Blasluftvorhanges remains relatively low.

In a further embodiment, it is preferably provided that the Blasluftquelle ejects the Blasluftvorhang clocked. Thus, the output of the Blasluftvorhanges be limited to a period in which the Blasluftvorhang the Bogenumlenkbereich happens in the same sense as the gripper, so that possibly undesirable occurring outside the Bogenumlenkbereiches flow conditions in the vicinity of the conveyed sheet can be avoided.

The invention is explained in more detail below with reference to the accompanying drawings.

Fig. 1

in schematischer Darstellung einen einen Ausleger umfassenden Abschnitt einer Bogen verarbeitenden Druckmaschine, wobei ein Ausführungsbeispiel der Blasluftquelle eine Baueinheit bildet mit einem Kettenradpaar einer Kettenradanordnung, die von Förderketten umschlungen ist, welche Greiferbrücken tragen, an denen jeweils eine Greiferreihe angeordnet ist,

Fig. 2

die aus dem Kettenradpaar und der Blasluftquelle gebildete Baueinheit der Fig. 1 im Zusammenwirken mit den Greiferreihen in einer der Fig. 1 entsprechenden Darstellung,

Fig. 2a

ein den Blasluftvorhang andeutendes Detail aus Fig. 1,

Fig. 3

eine Draufsicht auf die Baueinheit gemäß Fig. 2,

Fig. 4

eine Draufsicht auf eine für den Fall eines eintourig umlaufenden Blasluftvorhanges gegenüber Fig. 3 abgewandelte Baueinheit.

Hereby shows:

Fig. 1

1 is a schematic illustration of a section of a sheet-processing printing press comprising a cantilever, wherein an embodiment of the blast air source forms a structural unit with a sprocket pair of a sprocket assembly, which is surrounded by conveyor chains carrying gripper bridges on each of which a gripper row is arranged;

Fig. 2

the assembly formed by the sprocket pair and the blast air source of FIG. 1 in cooperation with the gripper rows in a representation corresponding to FIG. 1,

Fig. 2a

a hint of the blown air curtain detail of Fig. 1,

Fig. 3

a plan view of the assembly of FIG. 2,

Fig. 4

a plan view of a modified in the case of a single-speed circulating Blasluftvorhanges compared to FIG. 3 assembly.

As can be seen from Fig. 1, a boom 1 connects in the processing direction to a last processing station of the printing press. Such a processing station may be a printing unit or a post-treatment plant, such as a coating unit. In the present example, the last processing station is an offset printing unit 2 with a printing cylinder 2.1. This leads a respective sheet 3 in a direction indicated by the direction of rotation arrow 5 processing direction through a pressure gap between the impression cylinder 2.1 and a cooperating blanket cylinder 2.2 and transfers it in the present example, following a gripper row of a single-speed transfer drum 2.3 under opening a arranged on the printing cylinder 2.1, for detecting the sheet 3 to a gripper edge provided at the leading end of the sheet 3 gripper row. A corresponding transfer of the sheet 3 is then carried out by the single-speed transfer drum 2.3 to another in the present example half-round transfer drum 2.4, which finally passes the sheet 3 to the boom 1. This comprises two endless conveyor chains, of which a respective one in the vicinity of a respective side wall of the boom 1 operatively revolves along a closed chain path. A respective conveyor chain wraps around each one of two synchronously driven drive sprockets 7, whose axes of rotation are aligned, and is guided in the present example via one opposite the drive sprockets 7 downstream with respect to the processing direction Umlenkkettenrad 8, so that a respective one of the conveyor chains 6 passes through a closed chain path , Between the two conveyor chains 6 are supported by these gripper bars 9 with grippers 9.1, which pass through gaps between the arranged on the transfer drum grippers 2.4 and a respective sheet 3 while detecting said gripper edge at the leading end of the sheet 3 immediately before opening at the transfer drum 2.4 arranged gripper take him across a sheet guiding device 10 away to a braking station 11 and open after the transfer of the sheet 3 to the brake station 11. In the braking station 11, the sheets 3 are decelerated to a speed reduced compared to the processing speed and finally released, so that a respective now slowed sheet 3 finally impinges on leading edge stops 12 and aligned with these and these opposite trailing edge stops 13 together with Previous and / or subsequent sheet 3 forms a stack 14 which can be lowered by means of a hoist to the extent that the stack 14 increases. From the hoist in Fig. 1, only a stack 14 supporting platform 15 and this supporting, dash-dotted lines indicated lifting chains 16 are shown.

The conveyor chains 6 are guided along their paths between the drive sprockets 7 on the one hand and the Umlenkkettenrädern 8 on the other hand by means not shown chain guide rails which determine the chain tracks of the chain. In the present case, the sheets 3 are transported from the in Fig. 1 mainly lying below the chain center along a conveying path extending from the point of transfer of the sheet 3 from the printing cylinder 2.4 to the boom 1 to a point at the one in the region of one of the Umlenkkettenräder 8 arranged cam 4 a not shown in operative connection with the grippers 9.1 roller lever operated and thus the closed under spring tension gripper opens 9.1 releasing the sheet 3. The section of the chain track, which passes through the section of chain lying mainly at the bottom, is followed by a sheet guiding surface 17 facing the sheet guiding device. Between the latter and the respective sheet 3 passed over, a carrying air cushion is preferably formed. For this purpose, the sheet guiding device 10 is equipped with opening into the sheet guide 17 Blasluftdüsen, of which in Fig. 1, only a representative of their entirety, and in symbolic representation in the form of the neck 18 is reproduced.

In order to prevent mutual sticking of the printed sheets in the stack 14, the sheet 3 of the drive sprockets 7 are on the way to Brake 11, a dryer 19 and a dusting device 20 is provided.

To avoid excessive heating of the sheet guiding surface 17 through the dryer 19, a coolant circuit is integrated into the sheet guiding device 10, which is symbolically indicated in Fig. 1 by an inlet port 21 and an outlet 22 on one of the sheet guide 17 arranged coolant trough 23.

In the present example, said conveying path has a horizontal section, a branch ascending towards the horizontal section upstream of the latter and a sheet deflection zone 24 upstream of the latter, which presents a problematic area even if the sheets are only printed on one side, as they can perform uncontrolled movements without further action, which can cause a greasing of still fresh paint color.

One of these measures is, for example, radially outside of the grippers 9.1 traversed, the Bogenumlenkbereich 24 performing portion of the hook path a pneumatically actuated sheet guiding device 10 'provided, seen in the running direction of the gripper 9.1 has approximately the extension of Bogenumlenkbereiches 24. Advantageous embodiments of the sheet guiding device 10 ', the applicant has already described in the document US 5,456,178. These embodiments are preferably used here.

Another of the above measures is to support the Bogenumlenkbereich 24 passing sheet 3 a supporting this Blasluftvorhang 25 to judge. This is ejected from a Blasluftquelle 26, which is not fixed in contrast to the aforementioned boom but the Bogenumlenkbereich 24 happens in the same sense as the gripper 9.1.

In the aforementioned not necessarily required but preferably provided embodiment, in which the Blasluftvorhang 25 passes the Bogenumlenkbereich 24 synchronously with the grippers 9.1, a particularly simple construction of the sheet conveyor, and in fact that, as provided in the present embodiment, the Blasluftquelle 26 forms a structural unit with the sprocket pair formed by the drive sprockets 7.

In this case, the blown air source 26 is preferably formed using a pipe 26.1 arranged parallel to the axis of rotation of the drive chain wheels 7, which has in its longitudinal direction a series of blown air openings 26.2, one of which can be seen in FIG. 2a. However, the preference for a blast air source 26 configured in this way does not preclude ejecting the bend deflecting region 24 in the abovementioned blown air curtain 25 from blast air sources configured in a different way.

As shown in Figures 2 and 3, said assembly is formed in the present embodiment as follows.

The two drive sprockets 7 are rotatably connected to a journal 27.1 and 27.2 having sprocket axis 27. In each case adjacent to a respective one of the sprockets 7, the sprocket axle 27 carries one each connected in its circumferential direction frictionally connected thereto Hub 28. At the hubs 28 spokes 29 are adjustably mounted in the longitudinal direction, in the present example half-cycle drive sprockets 7 per hub 28 two spokes 29. Due to the half-speed design of the drive sprockets 7 are - as can be seen in particular in Fig. 3 - two blast air sources 26 is provided, of which a respective is formed in the manner already explained by means of a tube 26.1. The respective tube 26.1 is closed at its ends with a pin 30 projecting beyond the tube 26.1. A respective bore parallel to the axis of rotation of the drive sprockets 7 in the respective radially outer end of the spokes 29 slidably receives one of these spigots 30 in the bore. A respective thus mounted, used to form a Blasluftquelle pipe 26.1 is thus rotatable with respect to its longitudinal axis, and a certain rotational position of the same by means of at least one of the pipe 26.1 bearing spokes used and acting on one of the pins 30 clamping screw 31 can be fixed. Thus, the blowing direction of the blower air source 26 - here the said Blasdüsenreihe having tube 26.1 - operatively ejected Blasluftvorhanges is adjustable and is preferably adjusted so that it tends to counter the direction of the Bogenumlenkbereich 24 passing arc.

The extent explained, the blower air source 26 and the drive sprockets 7 comprehensive unit forms a drum body 32 which is received by means of the axle journals 27.1 and 27.2 rotatably provided in side walls 33 and 34 of the sheet conveyor 1 bearing bores 33.1 and 34.1. The sprocket axis 27 is formed so hollow that results in the axle journal 27.1 communicating with the bearing bore 33.1 cavity 35. This is in the present example, as shown in FIG. 3, realized in that the sprocket axis 27 of a tube 27 'and welded at its ends axle sections 27' and 27 ''' is composed, of which the axle portion 27 "is provided with an opening into the tube 27 'forming the cavity 35 through hole.

The axle journal 27.1 projects into only part of the depth of the bearing bore 33.1 and the end of the bearing bore 33.1 facing away from the sprocket axle 27 is closed by means of a cover 36 which has a connection nipple 37, via which the bearing bore 33.1 can be connected to a compressed air generator 38 ,

Between a respective pipe 26.1 provided for forming the respective blower air source 26 and the pipe 27 'of the sprocket axis 27 there is a connection made by means of flexible lines 39 so that ultimately a respective blower air source 26 communicates with the cavity 35.

In this way, a supply of the circulating Blasluftquellen 26 succeeds with compressed air, without a rotary feedthrough is required.

Since the respective spokes 29 carrying the blast air sources 26 are adjustably fixed to the hubs 28 in their longitudinal direction, the blast air curtain 25 can pass the sheet deflecting region 24 to the conveying path in a distance A within an adjustment range.

Since the tubes 26.1 forming the blast air sources 26 are carried by the spokes 29 by the hubs 28 adjustably connected circumferentially to the sprocket axis 27, the blast air curtain 25 can pass the sheet deflecting area 24 at an adjustable phase angle φ to the grippers 9.1.

The grippers 9.1 in turn pass through the Bogenumlenkbereich 24 during normal rotation of the drum body 32, which in particular includes the drive sprockets 37, which are looped by the gripper bars 9 supporting conveyor chains 6.

For operational rotation of the drum body 32, the sprocket axis 27 is rotatably connected in the present embodiment with a drive gear 40, which is a part of a connected to drive means gear train.

The extent set forth proves to be, as explained below, for other reasons as particularly advantageous.

As indicated in Fig. 1, the sheet guiding device 10 is preceded by a sheet troller 41, which is usually used in the case of single-sided sheet - here on the side facing away from the sheet guiding device 10 side of the sheet - while the sheet by means of a negative pressure in one to both side edges the bow draws vertical unrolling nip into it. However, said negative pressure only becomes fully effective in this sense when the respective sheet has been applied to the sheet troller 41. Since the latter is usually arranged in close proximity to the outlet region of the Bogenumlenkbereiches, the application of the sheet 3 is promoted to the Bogenentroller 41 by the Bogenumlenkbereich 24 passing Blasluftvorhang 25.

Furthermore, the preferred design of the blower air source 26, in the form of the pipe 26.1 carried by the spokes 29, provides the advantages of good accessibility of the sheet deflection area 24 for cleaning purposes and good visibility of the pipe Bogenumlenkbereiches 24, which is particularly helpful in the case of both sides printed sheet in the adjustment of the pneumatically actuated sheet guiding device 10 '.

Furthermore, the adjustability of the Blasluftquelle 26 with respect to the parameter blowing direction of the Blasluftvorhanges 25, distance of the Blasluftquelle 26 to the conveying path in Bogenumlenkbereich 24 and phase angle φ the Blasluftquelle 26 to the Bogenumlenkbereich 24 passing grippers 9.1 such adjustment of the spatial position of the Blasluftvorhanges 25 relative to the Drum body 32 that results in a compromise on the effect of the blown air curtain 25 on sheets with different basis weights and different stiffness. Of course, only a few of the mentioned parameters can be maintained for a plurality of different types of print jobs.

Another way of influencing the effect of Blasluftvorhanges is to change the pressure of the Blasluftquelle 26 supplied compressed air. This is indicated in Fig. 3 with the adjustable throttle 42.

In Fig. 4, an embodiment of a clocked ejection of the Blasluftvorhanges 25 from the Blasluftquelle 26 is indicated, namely the example of a Blasluftquelle 26 and the two drive sprockets 7 comprehensive assembly in the form of a drum body 32 ', although the drum body 32 shown in FIG. 3 in principle equals, but deviates from this insofar as this half-speed and that of FIG. 4 is formed a single-turn and thus only one the blown air source 26 performing pipe 26.1. In order to realize the pulsed output, the bearing bore 33.1 corresponding to the exemplary embodiment according to FIG. 3 can be connected to the compressed air generator 38 via a switching valve 43, which is mechanically exemplary here is alternately opened and closed by means of a synchronously with the drum body 32 'rotating cam 44 in operation. The phase position of the cam 44 relative to the drum body 32 'is set so that the switching valve 43 is opened when the Blasluftquelle 26 passes the Bogenumlenkbereich 24.

A corresponding but alternating clocked admission of the formation of the half-turn drum body 32 shown in FIG. 3 provided pipes 26.1 with compressed air is realized in an analogous manner and with a pertinent modification of the drum body 32 and its connection to the compressed air generator 38 that the two operationally a blown air curtain 25th ejecting tubes 26.1 are independently connected to the compressed air generator 38.

LIST OF REFERENCE NUMBERS

1

boom

2

printing unit

2.1

pressure cylinder

2.2

Blanket cylinder

2.3

single-speed transfer drum

2.4

Half-round transfer drum

3

bow

4

cam

5

Direction arrow

6

conveyor chain

7

drive sprocket

8th

nose wheel

9

gripper

9.1

grab

10

sheet guide

10 '

sheet guide

11

braking station

12

Leading-edge stop

13

Rear edge stop

14

stack

15

platform

16

lifting chain

17

sheet guide surface

18

Support

19

dryer

20

pollination device

21

inlet connection

22

outlet

23

Coolant tray

24

Bogenumlenkbereich

25

blast-air

26

blowing air source

26.1

the blown air source 26 forming pipe

26.2

Blasluftöffnung

27

sprocket

27 '

Sprocket axle tube 27

27 ", 27 '' '

Axial section of the sprocket axle 27

27.1; 27.2

Spigot of sprocket axle 27

28

hub

29

spoke

30

spigot

31

clamping screw

32, 32 '

drum body

33

Side wall

33.1; 33.2

bearing bore

34

Side wall

35

cavity

36

cover

37

connecting nipple

38

Air compressor

39

flexible line

40

drive gear

41

sheet decurler

42

adjustable throttle

43

switching valve

44

cam

A

distance

φ

phase angle

Claims (9)

1. Delivery of a sheet-processing machine, in particular of a printing press, having gripper rows (9.1) drawing the sheets along a conveying section during operation, endless conveyor chains (6) passing the delivery during operation in a revolving direction and carrying the gripper rows, a pair of chain wheels (7, 8) that are rotatable about a common axis of rotation, engage the conveyor chains, and form a deflecting region (24) of the conveying section, and a blast-air source expelling a blast-air curtain (25) to be applicable to a side of sheets passing the sheet-deflecting region (24), the side facing the axis of rotation,
   characterized in
   that during the application of the blast-air curtain (25) to the sheets (3) passing the sheet deflecting region (24), the blast-air curtain (25) passes the sheet deflecting region (24) in the same sense as the grippers (9.1).
2. Delivery according to claim 1,
   characterized in
   that the blast-air curtain (25) passes the sheet deflecting region (24) in synchronism with the grippers (9.1).
3. Delivery according to claim 1,
   characterized in
   that the blast-air curtain (25) tends to blow against the direction of travel of the sheets (3) passing the sheet deflecting region.
4. Delivery according to claim 1,
   characterized in
   that the blowing direction of the blast-air curtain (25) is adjustable.
5. Delivery according to claim 1,
   characterized in
   that the blast-air curtain (25) passes the sheet deflecting region (24) at an adjustable distance (A) from the conveying section.
6. Delivery according to claim 1,
   characterized in
   that the blast-air curtain passes the sheet deflecting region (24) in an adjustable phase angle (ϕ) relative to the grippers (9.1).
7. Delivery according to claim 1,
   characterized in
   that a drum body (32, 32') carrying the blast-air source (26) is provided, the drum body (32, 32') comprising an axial journal (27.1) that is received in a bearing bore (33.1) of a side wall (33) and has a cavity (35), that the blast-air source (26) communicates with the cavity (35) and the cavity (35) communicates with the bearing bore (33.1), and that the bearing bore (33.1) is connectible to a compressed-air source (38).
8. Delivery according to claim 1,
   characterized in
   that the blast-air source (26) expels the blast-air curtain (25) cyclically.
9. Sheet-processing printing press,
   characterized by
   a delivery according to at least one of claims 1 to 8.