WO2009149995A1

WO2009149995A1 - Air guidance for a belt delivery in a sheet-fed printing press

Info

Publication number: WO2009149995A1
Application number: PCT/EP2009/055480
Authority: WO
Inventors: Oliver Flick; Bernhard Graziel; Christof Winkler
Original assignee: Manroland Ag
Priority date: 2008-05-28
Filing date: 2009-05-06
Publication date: 2009-12-17
Also published as: JP2011521808A; CN102046503A; DE102008025403B4; DE102008025403A1

Abstract

The invention relates to a belt delivery for a sheet-fed printing press designed to receive sheets exiting a printing press in the sheet output region and to deposit said sheets in a delivery section to form a sheet stack (B5). The aim of the invention is to provide solutions for further counteracting the spread of emissions in the sheet delivery region. According to the invention, this is achieved by a belt delivery for a sheet-fed printing press, comprising a gripper track unit (1) that extends between a sheet infeed region and a sheet delivery region (B4), provided for the formation of a sheet stack (B5), and a lower track strand (TU) that runs from the sheet infeed region to the sheet delivery region (B4) and guides said sheets, in addition to an upper track strand (TO) that runs from the sheet delivery region (B4) back to the sheet infeed region without sheets. A track deflector (KU) is provided in the sheet delivery region and is used to propel the gripper systems (31) that run on the lower track strand (KU) upwards to the upper track strand (TO). The belt delivery is characterised in that a blower unit (4) is provided in a region lying below the track deflector (KU) along the front edge (QK) of the sheet stack (B5), said unit discharging an air curtain (5) that is directed upwards and that shields the web chamber, which is traversed by gripper systems (31) travelling upwards, from the environment.

Description

Air duct in a boom for a sheetfed press

Field of the invention

The invention relates to a boom for a sheet-fed printing machine which, as such, serves to receive the sheets leaving the sheet exit area of a printing press and to deposit them in a delivery section to form a sheet stack. The invention is also directed to a method for accomplishing the air duct in the field of sheet delivery

Background of the invention

In the case of such sheet delivery arms, it is customary to load the respective incoming sheets with powder in particular in order to effect the depositing of coated printing materials. Both by this powder, as well as by the tapered bow itself can cause undesirable emissions in the area of the boom. These emissions are counteracted by suction devices by which at least part of the released emissions in the region of the boom can be tapped and fed to a filter device.

Object of the invention

The invention has for its object to provide solutions by which it is possible to continue the spread of emissions in the field of sheet delivery counter. Inventive solution

This object is achieved according to the invention by a boom for a sheet press with a gripper chain device which extends between a sheet input area and a sheet delivery area provided for forming a sheet stack and a lower and in this case sheet-guiding chain center running from the sheet entrance area to the sheet delivery area and one of the sheet delivery area to the sheet entrance area without bow returning upper warp center, wherein in the area of the sheet delivery a chain deflection is provided over which accumulate over the lower warp end converging gripper systems up to the upper warp, this boom is characterized in that in one under the chain deflection lying region along the front stacking edge of the sheet pile a blowing device is provided, for blowing off an upwardly directed and the inflowing over the sheet pile airflow upwards air curtain.

This makes it possible in an advantageous manner to provide a boom in which a surprisingly effective way, a spread of the over the sheet storage area of the gripper systems entrained and polluted air can be prevented in the environment.

The blowing device is designed according to a particularly preferred embodiment of the invention as substantially horizontal and parallel to the front upper transverse edge of the sheet stack aligned blowpipe. This blowpipe is preferably integrated directly into a front Geradstoßermechanik. This blowpipe is in this case preferably arranged such that it extends at a height level which corresponds to the usual height level of the uppermost layer of the sheet pile.

Preferably, an upper Absaugquerkanal is formed in one of the chain deflection upstream region. The air generated by the blowing device slope is preferably blown aligned so that it flows into the upper Absaugquerkanal.

According to a particular aspect of the present invention, a second blowing device is provided which is arranged in an area encompassed by the chain deflection inner area and blows off a second air curtain which passes through the traversed by the returning gripper systems track space. This second blowing device is also preferably designed such that it comprises a second blowing tube.

The air curtains, which are blown upwards by the two blowing devices, are preferably aligned substantially parallel to one another. The discharge angle of the two air curtains with respect to the horizontal are preferably in the range of 45 to 70 °. It is possible to design the upper transverse channel in such a way that the two air processes can be picked up together there.

The arranged in the region of the front Geradstoßers blower is preferably formed so that the first blowpipe is mounted on a core tube, wherein in the core tube and the blowpipe outlet openings are formed which align with alignment of a Geradstoßers in working position, and wherein the Geradstoßer together with the Blowing tube is zurückschwenkbar and in the pivoted-back position, the outlet openings of the core tube relative to the outlet openings of the blowpipe offset and thus the blower arrangement are turned off.

According to the invention at least one blowpipe is integrated at the level of the front Geradstoßers in the sheet delivery that generates an air curtain. The air curtain produced thereby deflects ruptured streams of powder contaminated air and prevents them from leaving the boom. Furthermore, the air curtain deflects the powder-contaminated air to a particularly effective extraction point, via which the powder-contaminated air can be specifically sucked. By means of the concept according to the invention, it is also possible with a second blower tube to produce a further air curtain, which encloses the powder-contaminated air in a defined space. This room is delimited by the two air curtains and the protection (front, top and side).

In the inventive concept, the test sheet removal, as well as the view of the stacking and display area is not affected by mechanical elements. Furthermore, it is not blown directly into a suction, but created a storage space from which the powder-contaminated air can leave the boom only through the suction.

As already mentioned, the blowpipe can be integrated into the "front straight stoppers" assembly at the front stacking edge.The second blowpipe can optionally be provided to also delimit the air tap room to the rear.

The blowing device according to the invention may comprise a mechanism for opening and closing the air outlet path. In the front Geradstoßer a fixed pipe can be integrated and pressurized from the inside with compressed air. In working position, the compressed air can escape through aligned holes and thus forms the air curtain. In the test sheet removal position, the straight jogger is rotated by 90 ° with the outer pipe, the inner pipe stops. This prevents air leakage.

Furthermore, it is possible to form an air inlet opening in the region of the upper protection of the boom. Through this opening fresh air can be sucked from the blow frame and conveyed down. Under the blower frame, the air is caught by the gripper systems and entrained. In the deflection area, the air flows break off. Then they are deflected by blowpipe up and promoted by the extraction point from the sheet delivery. The preferably provided second blowpipe prevents powder-contaminated air from passing through the gripper systems in the rear region of the sheet delivery. The blower tube can be designed such that it has a plurality of blowing nozzles which follow one another in the longitudinal direction, the air streams blown off in each case in a directed manner forming the air curtain. The nozzles can also be designed as slot nozzles. The blower tube can also be designed so that the cross section of the blowing nozzles, in particular the blowing slots is adjustable variable. For this purpose, it is particularly possible to make the blowpipe in several parts, for example by two longitudinal shells, or elastically deformable, so that, for example, the Blasdüsenquerschnitt can be adjusted by elastic expansion, or collapse of a trained in the blowpipe longitudinal slot section. Furthermore, it is also possible to arrange in the vicinity of the nozzles small Luftleitstege or guide plates through which a targeted approach and acceleration of ambient air can be achieved. This concept makes it possible to realize a particularly favorable speed profile of the air within the air process, in particular in a viewing plane which is radial to the longitudinal axis of the blower tube. The blower tube may be provided with a Ummante- ment which is made of a sound-absorbing material, in particular a foamed rubber material. This makes it possible to absorb sound events generated in the area of the tuyeres to a considerable extent.

The blowpipe can be designed so that the blown air is made available via a compressed air line at a relatively high pressure level. Alternatively, it is also possible to provide blower devices in the region of the blower tube through which the required blown air is sucked in and conveyed to a pressure level suitable for forming a sufficiently loadable air curtain. The blower pipe device according to the invention can be designed as a retrofit kit which can be connected to common front straight stirrer systems without special installation effort, or can be added to them.

The object specified above is also achieved by a method with the features specified in claim 13. Brief description of the figures

Further details and features of the invention will become apparent from the following description in conjunction with the drawings. It shows:

Figure 1 is a schematic representation to illustrate the construction of a boom according to the invention for a sheet-fed press;

FIG. 2 shows a further schematic representation to illustrate the construction of a boom according to the invention for a sheet-fed printing press with an ambient-ventilated blow frame arranged above the sheet-laying area

FIG. 3 a shows a functional diagram for illustrating a blower tube according to the invention in blow position;

Figure 3b is a functional diagram for illustrating the blower tube according to

Figure 3a in the locked position.

Detailed description of the figures

FIG. 1 shows, in a simplified representation, the front region of a cantilever for a sheet-fed printing press. The boom comprises a gripper chain device 1 which extends between an arch entrance area, not shown here, and a sheet delivery area BA provided for forming a sheet stack BS.

The gripper chain device 1 comprises a lower and in this case sheet-guiding chain center TU tapered from the sheet entrance area to the sheet delivery area BA, and an upper warp center TO that returns from the sheet delivery area BA to the sheet entrance area without a sheet. Above the front transverse edge QK of the sheet pile BS there is provided a chain guide KU, designed as a chain guide track, or optionally as a sprocket, over which the gripper systems 3 tapering over the lower chain center TU run upwards to the upper chain center TO.

The boom according to the invention is characterized in that in a below the chain deflection KU lying area along the front stacking edge QK of the sheet stack BS a blowing device 4 is provided for blowing an upwardly and traversed by the upwardly sloping gripper systems 3 track space of the Outside environment at least largely Abschabottenden air curtain 5.

The possibly contaminated air flow VK is prevented from escaping into an environment upstream of the boom by the air curtain 5 and forced to a suction point 6.

The blowing device 4 is designed as a blowpipe in this embodiment. This blowpipe is embedded in a Geradstoßer not shown here by which also the end position of the transverse edge QK of the sheet stack BS is set.

In the embodiment shown here, the blowing device 4 extends at a height level which corresponds to the usual height level HB of the uppermost layer of the sheet stack BS.

The suction device 6 is formed in this embodiment in a chain deflection KU upstream region as the upper Absaugquerkanal. Although not shown here, it is possible to blow off the air curtain 5 in such an orientation that it flows into the upper exhaust cross channel.

In the exemplary embodiment shown here, a second blowing device 7 is furthermore provided, which is located in an inner area encompassed by the chain deflection. rich arranged and blows off a second air curtain 8 passes through the traversed by the returning gripper systems 3 ^' track space. Also, this second blowing device 7 is made in this embodiment by a blowpipe with corresponding exhaust nozzles.

The two blowing devices are preferably designed so that the two air curtains 5, 8 are aligned substantially parallel to each other. The discharge angle of the two air curtains with respect to the horizontal are in this embodiment in the range of 45 to 70 °. Both air processes can hereby be formed in such a way that they are jointly picked up by the upper exhaust cross channel. The "crossbar-like" intermediate space defined between these two air curtains serves as an air guiding space through which the possibly contaminated air stream VK introduced into the deflection zone KU is effectively introduced into the suction device 6. The air curtain 5 seals off the air flow VK flowing over the front transverse edge A certain forced guidance of the air flow VK and a partitioning of the latter relative to the following section reaches the trajectory of the upper gripper chain center TO following the deflection zone KU through the second air curtain 8. The air curtain 8 continues to convey a certain amount of transverse scavenging Track space of the returning gripper systems 3 ^' achieved.

For the embodiment shown in Figure 2, the foregoing explanations apply mutatis mutandis. In this exemplary embodiment, a blowing frame 10 is provided above the lower gripper chain center TU and above the depositing area BA, this blowing frame 10 being ventilated via an opening region 12 located in the machine protection 11. By this concept it is avoided that the blow frame 10 sucks in excess air from the input area of the boom. In addition, this concept achieves a further flushing of the gripper system web space returning above the blower frame 10 through the air flowing in via the opening 12. The air flows blown off via the blowing devices 4 and 7, the suction volume flow discharged via the suction 6, and the delivery rate of the blow frame and the air passage through the opening region 12 are preferably matched by a control device. This control device can be designed such that it carries out parametric, or otherwise map-based, activation of these air flows to the instantaneous machine operating state, so that, for example, correspondingly increased blower outputs are set at high delivery cycle numbers.

FIG. 3 a shows a particularly preferred embodiment of a blowing device 4 according to the invention. In this variant, a first blower tube 40 is placed on a core tube 41. Both in the core tube 41, as well as in the blowpipe 40 outlet openings 42, 43 are formed which are aligned when aligning a Geradstoßers 44 in working position with each other.

As can be seen from the illustration according to FIG. 3b, the straight-pusher 44 can be pivoted back together with the blower tube 40 about the core tube 41. In the position shown here pivoted back, the outlet openings 42 of the core tube 41 are offset from the outlet openings of the blower tube and thus locked. The gap shown here only serves to facilitate the identification of the components. Specifically, this gap is dimensioned so that this only corresponds to the movement required to sufficiently smooth movement.

Claims

claims

A boom for a sheet-fed printing machine, comprising: a gripper chain device (1) which extends between an arc entrance area and a sheet delivery area (BA) provided for forming a sheet stack (BS) and a lower and, in this case, sheet-guiding chain center, running from the sheet entrance area to the sheet delivery area (TU), as well as one from the sheet delivery area (BA) to the sheet entrance area without arch returning upper warp center (TO), wherein in the area of the sheet delivery (BA) a chain deflection (KU) is provided via which the over the lower chain center (TU ) run up to the region of the upper warp (TO), characterized in that in a below the chain deflection (KU) lying area along the front stack edge (QK) of the sheet stack (BS) a blowing device (4 ) is provided for blowing off an upward directed and the over the sheet stack (BS) flowing air stream (VK) upward sloping air curtain (5).

2. boom according to claim 1, characterized in that the blowing device (4) is designed as a blow pipe (40).

3. boom according to claim 2, characterized in that the blowing device (4) in a front Geradstoßer (44) is integrated.

4. boom according to claim 2 or 3, characterized in that the blowing device (4) extends at a height level (HB) which corresponds to the usual height level of the uppermost layer of the sheet pile (BS).

5. A boom according to at least one of claims 1 to 4, characterized in that in one of the chain deflection (KU) upstream region, an upper Absaugquerkanal (6) is formed.

6. A boom according to claim 5, characterized in that the air curtain (5) is blown aligned so that this on the incoming air flow (VK) in the upper Absaugquerkanal (6) pushes off.

7. A boom according to at least one of claims 1 to 6, characterized in that a second blowing device (7) is provided which is arranged in an area encompassed by the Kettenumlenkung (KU) inner region and a second air curtain (8) blows off the of traversed by the returning gripper systems.

8. A boom according to claim 7, characterized in that the second blowing device (7) comprises a second blower tube.

9. boom according to claim 7 or 8, characterized in that the two air curtains (5, 8) are aligned substantially parallel to each other.

10. A boom according to claim 9, characterized in that the discharge angle of the two air curtains (5, 8) relative to the horizontal in the range of 45 ° to 90 °.

11. A boom according to claim 10, characterized in that the two air processes (5, 8) are formed such that they are picked up together by the upper Absaugquerkanal (6).

12. A boom according to at least one of claims 1 to 11, characterized in that the first blower tube (40) is mounted on a core tube (41), wherein in the core tube (41) and the blowpipe (40) outlet openings (42, 43) are formed which are in alignment with one another when aligning a Geradstoßers (44) in working position, and wherein the Geradstoßer (44) together with the blowpipe (40) is pivotable back and in the pivoted-back position, the outlet openings (43) of the core tube opposite the outlet openings (42) the blowing tube (40) offset and thus the blowing arrangement are turned off.

13. A method for effecting the air duct in the region of the sheet delivery of a sheet delivery in which the flowing to a front transverse edge region of the sheet stack and this area overflowing air deflected by a NEN from the region of the transverse edge of the sheet stack ascending air curtain blown upwards and to a suction point which is pushed above the gripper system feed level and in the vicinity of the Greiferkettenumlenkbereich.

14. The method according to claim 13, characterized in that the extraction point is located approximately at the level of the return plane of the gripper systems, as well as in front of the sheet pile, or immediately before the gripper chain deflection in the inner corner of a boom protection.