DE102008025403A1 - Boom for a sheet-fed press, and method for managing the air duct in such a boom - Google Patents

Abstract

The invention relates to a boom for a sheet-fed printing machine, which serves as such to record the expiring in the sheet exit area of a printing press sheet and store in a delivery section to form a stack of sheets. The invention has for its object to provide solutions by which it is possible to continue to oppose the spread of emissions in the field of sheet delivery. This object is achieved by a boom for a sheet-fed press with a gripper chain device extending between an arc entrance area and a sheet stacking sheet delivery area and a tapered from the sheet entrance area to the sheet delivery area lower and this arc leading chain and one of the sheet delivery area to the sheet entrance area without Arc running back upper warp center, wherein in the region of the sheet delivery, a chain deflection is provided, over which run over the lower chain center gripper systems accumulate up to the upper chain center, this boom is characterized in that in a lying under the chain deflection area along the front blowing edge of the sheet stack, a blowing device is provided for blowing off an upwardly directed and traversed by the upwardly sloping gripper systems track space air curtain partitioning from the outside environment.

Description

Field of the invention

The The invention relates to a boom for a sheet-fed printing machine of as such serves to expire in the sheet exit area of a printing press Receive sheet and in a delivery section to form a Discard pile of sheets. The invention continues to be directed to a method for managing the air duct in the area of the sheet delivery

Background of the invention

at such sheet delivery is in particular to Bewerkigung the filing of coated substrates usual the respective tapered Load sheets with powder. Both through this powder, as well Due to the tapered bow itself, it can be in the area of the boom to unwanted emissions come. These emissions are counteracted by suction devices by which at least part of the released in the region of the boom Emissions are tapped and fed to a filter device can.

Object of the invention

Of the Invention has for its object to provide solutions by which it possible is the spread of emissions in the area of sheet delivery continue to counter.

Inventive solution

These The object is achieved by a boom for a sheet-fed printing machine with a gripper chain device itself between an arch entrance area and one to form a Sheet pile provided sheet delivery area extends and a from the sheet entrance area to the sheet display area lower and here arc leading Chain center and one from the sheet delivery area to the bow entrance area returning without bow has upper chain center, wherein in the area of the sheet delivery a Chain deflection is provided via which the above the lower chain center tapering gripper systems up to the accumulate upper chain center, whereby this boom is characterized that in a lying under the chain deflection area along the front stack edge of the sheet stack provided a blowing device is, for blowing one upwards and the over the Sheet pile inflowing Airflow upwards Air curtain.

Thereby is it possible in an advantageous manner to provide a boom in which in a surprisingly effective manner a spread of over the sheet storage area of the gripper systems entrained and contaminated air into the environment can be prevented.

The Blowing device is according to a particularly preferred embodiment of the invention as being substantially horizontal and parallel to the front upper Cross edge of the sheet stack aligned blowpipe executed. This Blowpipe is preferably integrated directly into a front Geradstoßermechanik. This blowpipe is in this case preferably arranged so that this at a height level extends that to the usual Height level of corresponds to the top layer of the sheet pile.

Preferably is in an upstream of the chain deflection area an upper Absaugquerkanal formed. The generated by the blower Air curtain is preferably blown aligned so that this flows into the upper Absaugquerkanal.

According to one particular aspect of the present invention is a second blowing device provided in an encompassed by the chain deflection inner area is arranged and a second air curtain blows off the from the returning ones Tracker systems crossed traversed railway space. Also this second Blowing device is preferably designed so that this one second blowpipe includes.

The blown up by the two blowing devices ascending upward air curtains are preferably aligned substantially parallel to each other. The discharge angle of the two air curtains relative to the horizontal lie preferably in the range of 45 to 70 °. It is possible the upper cross channel train so that over these the two air processes can be taken together.

The In the area of the front Geradstoßers arranged blowing device is preferably formed so that the first blowpipe on a Core tube is placed, wherein in the core tube and the blowpipe outlet openings are formed when aligning a Geradstoßers in Working position aligned, and wherein the Geradstoßer together swung back with the blowpipe is in and swung back Position the outlet openings of the core tube opposite the outlet openings of the Blasrohrs offset and thus the blowing 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 generated here deflects abge Cracked flows of powder contaminated air around 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 the inventive concept it is also possible to create another air curtain with a second blowpipe which encloses the powder contaminated air in a defined space. This Space is controlled by the two air curtains and the protection (front, above and on the side).

at the inventive concept is the sample sheet removal, as well as the view of the stack and Display area 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 the Can only leave boom through the suction.

The Blowpipe can, as already mentioned at the front stacking edge into the assembly "front Geradstoßer "integrated become. The second blowpipe may optionally be provided around the air tap room also to delineate behind.

The Blowing device according to the invention can have a mechanism for opening and closing the Luftaustrittsweges include. In the front Geradstoßer can integrated a fixed pipe and pressurized from the inside with compressed air become. In working position, the compressed air can be through aligned holes escape and thus forms the air curtain. In the sample sheet removal position becomes the Geradstoßer with the outer tube turned 90 °, the inner tube stops. This prevents air leakage.

Farther Is it possible to form an air inlet opening in the area of the upper protection of the boom. Through this opening fresh air can be sucked in from the blower frame and conveyed downwards. Under the blower frame, the air is captured by the gripper systems and carried away. In the deflection area, the air flows break off. Then they are deflected by blowpipe up and through the suction conveyed from the sheet delivery. The preferably provided second blowpipe prevents powder-contaminated Air through the gripper systems in the rear of the sheet delivery arrives.

The Blowpipe can be designed so that these several in the longitudinal direction subsequent blowing nozzles has, whereby thereby each directionally blown off air streams the air curtain form. The nozzles can also as slit nozzles be educated. The blowpipe can also be designed so that the cross section of the blowing nozzles, In particular, the blow slots can be adjusted adjustably. This is it especially possible the blowpipe in several parts, z. B. by two longitudinal shells, or elastic make deformable, so that, for example, the Blasdüsenquerschnitt by elastic expansion, or collapse of one in the blowpipe trained longitudinal slot section can be adjusted. Furthermore, it is also possible in the neighborhood of nozzles small baffles or guide panels through which a targeted approach and acceleration of Ambient air can be achieved. Through this concept it becomes possible within the air process, in particular in a radial to the longitudinal axis of the blower tube Viewing level a particularly favorable speed profile to realize the air. The blowpipe can with a sheath be provided with a sound-absorbing material, in particular a foamed Rubber material is made. This will make it possible in the Area of the tuyeres to absorb generated sound events to a considerable extent.

The Blowpipe can be designed so that the blowing air over a Compressed air line provided at a relatively high pressure level becomes. Alternatively, it is also possible in the area of the blowpipe blowers provide by which the needed Blown air sucked in and on to form a sufficiently strong Air curtain appropriate pressure level is promoted. The blower pipe device according to the invention can be used as a retrofit kit accomplished be the front without special installation effort on Geradstoßersysteme attachable, or is zuistellbar to these.

The The object stated at the outset continues also by a method solved 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 connection with the drawing. It shows:

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

2 a further schematic representation to illustrate the structure of a boom according to the invention for a sheet-fed press with a above the sheet storage area arranged, ventilated blower frame

3a a functional diagram illustrating a blow pipe according to the invention in blow position;

3b a functional diagram for illustrating the blowpipe after 3a in locked position.

Detailed description of the figures

1 shows a simplified representation of the front portion of a boom for a sheet-fed 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 here arc-guiding chain center TU tapered from the sheet entrance area to the sheet delivery area BA, and an upper warp center TO which returns from the sheet delivery area BA to the sheet entrance area without a sheet.

Above the front transverse edge QK of the sheet stack BS is designed as a chain guide track, or possibly also as a sprocket chain deflection KU is provided via which the over the lower chain center TU tapered gripper systems 3 accrue up to the upper chain point TO.

The boom according to the invention is characterized in that in a below the chain deflection KU lying area along the front stack transverse edge OK of the sheet stack BS a blowing device 4 is provided, for blowing an upwardly directed and that of the upwardly sloping gripper systems 3 traversed railway space from the outside environment at least largely Abschschottenden air curtain 5 ,

Through the air curtain 5 the possibly contaminated air stream VK is prevented from escaping into the environment upstream of the boom and to a suction point 6 pushed away.

The blowing device 4 is designed in this embodiment as a blowpipe. This blowpipe is incorporated into a Geradstoßer not shown here by which the end position of the transverse edge is fixed OK of the sheet stack BS.

In the embodiment shown here, the blowing device extends 4 at a height level corresponding 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 use the air curtain 5 blow out aligned so that it flows into the upper Absaugquerkanal.

In the embodiment shown here is also a second blowing device 7 provided, which is arranged rich in an encompassed by the chain deflection Innenbe and a second air curtain 8th that blows off the of the returning gripper systems 3 ' traversed through traversed railway 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 . 8th 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 in this case be formed in such a way that they are jointly picked up by the upper exhaust cross channel. The defined between these two air curtains "crossbar-like" gap serves as an air guide space through which the entrained in the deflection KU, possibly contaminated air flow VK effectively into the suction 6 is introduced. Through the air curtain 5 a foreclosure of the flowing over the front transverse edge air flow VK is achieved by the front environment of the boom. Through the second air curtain 8th is a certain forced operation of the air flow VK and a foreclosure of the same with respect to the subsequent section of the deflection zone KU subsequent track space of the upper gripper chain center TO reached. Through the air curtain 8th continues to be a certain cross-scouring of the track space of the returning gripper systems 3 ' reached.

For the in 2 illustrated embodiment, the preceding explanations apply mutatis mutandis. In this exemplary embodiment, a blow frame arranged above the lower gripper chain center TU and above the storage area BA is shown 10 provided, this blow frame 10 about one in the machine protection 11 lying opening area 12 is ventilated. This concept avoids the blow frame 10 in excess air sucks from the input area of the boom. In addition, this concept is a further flushing of the above the blow frame 10 returning gripper system track space through the opening 12 reached incoming air.

The about the blowing devices 4 and 7 abge blown air flows through the suction 6 discharged suction volume flow, as well as the delivery rate of the blow frame and the air passage through the opening area 12 are preferably tuned by a control device. This control device can be configured such that it carries out a parametric, or otherwise map-based, activation of these air flows to the current machine operating state, so that, for example, correspondingly increased blowing powers are set at high output cycle counts.

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

As shown 3b it can be seen the Geradstoßer 44 together with the blowpipe 40 around the core tube 41 zurückschwenkbar. In the position shown here, zurückgeschwenkten position are the outlet openings 42 of the core tube 41 offset from the outlet openings of the blowpipe and thus blocked. 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 (14)

Boom for a sheet-fed printing machine, comprising: a gripper chain device ( 1 ) extending between an arc entrance area and a sheet delivery area (BA) for forming a sheet stack (BS), and a lower and thereby sheet-guiding chain center (TU) tapering from the sheet entrance area to the sheet delivery area and one from the sheet delivery area (BA) to the sheet entrance area without a sheet Returning upper chain center (TO), wherein in the region of the sheet delivery (BA) a chain deflection (KU) is provided via which the over the lower chain center (TU) tapered gripper systems ( 3 ) accumulate upwards to the region of the upper warp center (TO), characterized in that in a region below the chain deflection (KU) along the front stacking edge (OK) of the sheet stack (BS) a blowing device ( 4 ) is provided for blowing off an upwardly directed air curtain (VK) which flows upward over the sheet stack (BS) and upwardly delineating air curtain (US Pat. 5 ). Boom according to claim 1, characterized in that the blowing device ( 4 ) as a blowpipe ( 40 ) is executed. Boom according to claim 2, characterized in that the blowing device ( 4 ) in a front Geradstoßer ( 44 ) is involved. 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). Boom according to at least one of claims 1 to 4, characterized in that in an area of the chain deflection (KU) upstream region an upper Absaugquerkanal ( 6 ) is trained. Boom according to claim 5, characterized in that the air curtain ( 5 ) is directed in such a way that this flows into the upper Absaugquerkanal (VK) in the upper Absaugquerkanal ( 6 ). 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 chain deflection (KU) inside area and a second air curtain ( 8th ) blows through the traversed by the returning gripper systems track space interspersed. Boom according to claim 7, characterized in that the second blowing device ( 7 ) comprises a second blowpipe. Boom according to claim 7 or 8, characterized in that the two air curtains ( 5 . 8th ) are aligned substantially parallel to each other. Boom according to claim 9, characterized in that the blow-off angle of the two air curtains ( 5 . 8th ) is in the range of 45 ° to 90 ° to the horizontal. Boom according to claim 10, characterized in that the two air processes ( 5 . 8th ) are formed so as to be common to the upper Absaugquerkanal ( 6 ) are taken up. Boom according to at least one of claims 1 to 11, characterized in that the first blowpipe ( 40 ) on a core tube ( 41 ) is placed, wherein in the core tube ( 41 ) and the blowpipe ( 40 ) Outlet openings ( 42 . 43 ) are formed when aligning a Geradstoßers ( 44 ) are aligned in working position, and wherein the Geradstoßer ( 44 ) together with the blowpipe ( 40 ) back is pivotable and in the swung-back position, the outlet openings ( 43 ) of the core tube opposite the outlet openings ( 42 ) of the blower tube ( 40 ) and thus the blowing arrangement are turned off. Method for managing the air flow in the Area of the sheet delivery of a sheet delivery in which the on a front transverse edge region of the sheet stack inflowing and this area overflowing air by one from the region of the transverse edge of the sheet pile after upwards deflected air curtain deflected and to a Suction point pushed away will be located above the gripper system infeed level and adjacent to the gripper chain deflection area. Method according to claim 13, characterized in that that the extraction point is approximately at the level of the return plane of the gripper systems, as well as in front of the sheet stack, or immediately before the gripper chain deflection area located in the inner corner of a boom protection.