Sheet-loading arm of a printing press

Abstract

A sheet delivery unit of a printing press, comprising a first wall (1) and a second wall (2), between which a stack (3) is arranged, forming a delivery level (4) for sheets (5), wherein a first space (6) and a second space (7) are located between the stack (3) and the first wall (1) and between the stack (3) and the second wall (2), respectively, and to which at least one first extraction opening (8) and at least one second extraction opening (9) are assigned. The first wall (1) and the second wall (2) each have an upper edge (10, 11) located below the delivery level (4). The first extraction opening (8) and the second extraction opening (9) are located below the upper edges (10, 11) of the first wall (1) and the second wall (2) or not higher than the upper edges (10, 11). Above the storage level (4) or in the area of ​​the storage level (4) at least one first blow outlet (12) and at least one second blow outlet (13) are arranged.The first blowing outlet (12) and the second blowing outlet (13) are oriented as blowing air curtains (14, 15) expelling into the first space (6) and the second space (7).

Description

[0001] The present invention relates to a sheet delivery device of a printing press, comprising a first wall and a second wall, between which a stack is arranged, which forms a depositing plane for sheets, wherein between the stack and the first wall and between the stack and the second wall there are a first intermediate space and a second intermediate space, in which at least one first suction opening and at least one second suction opening are arranged.

[0002] Sheet stackers are equipped with containment and extraction systems to prevent or at least minimize the escape of air contaminated with stray powder into the environment. One problem is that the walls of the containment systems impair visibility and accessibility to the sheet stack.

[0003] DE 197 53 890 C1 describes a sheet delivery device in which the stack is located in a chamber closed on the four side surfaces, with the upper edges of the chamber walls projecting beyond the stack.

[0004] DE 10 2007 003 880 A1 describes a sheet delivery device in which suction openings are arranged in the area of ​​the lower edge of the stack.

[0005] The object of the invention is to create a user-friendly sheet delivery device.

[0006] This object is achieved by a sheet delivery device of a printing press, comprising a first wall and a second wall, between which a stack is arranged, forming a deposit level for sheets, wherein between the stack and the first wall and between the stack and the second wall there are a first intermediate space and a second intermediate space, to which at least one first suction outlet and at least one second suction outlet are assigned, characterized in that the first wall and the second wall each have an upper edge which is located below the deposit level, that the suction outlets are arranged below the upper edges of the first wall and the second wall or not higher than the upper edges, that above the deposit level or in the region of the deposit level there are arranged at least one first blow outlet and at least one second blow outlet,and that the first blowing orifice and the second blowing orifice are oriented to expel blowing air curtains into the first intermediate space and the second intermediate space.,

[0007] The sheet delivery system according to the invention is user-friendly, with the delivery level being easily visible and accessible through the blast air curtains. The first and second walls do not impede visibility or accessibility because their upper edges are located below the delivery level.

[0008] The further developments of the invention described below can be implemented individually or – insofar as they are not technically mutually exclusive – in any combination: The first blow outlet and the second blow outlet can be arranged on a third wall and a fourth wall, between which fans can be arranged, whose air flows are directed toward the storage level. The third wall and the fourth wall can each have a lower edge located above the storage level.

[0009] The first wall and the second wall can be arranged in a U-shape together with a cross wall. The cross wall can have an upper edge that is below the storage level.

[0010] A third intermediate space can be located between the stack and the transverse wall, to which at least one third suction outlet can be assigned. At least one third blower outlet can be arranged above the stacking level, which is oriented to expel a blast air curtain into the third intermediate space.

[0011] The first blowing orifice, the second blowing orifice and / or the third blowing orifice can each be a blowing slot nozzle or part of a blowing nozzle row.

[0012] Further developments, which can be implemented individually or - insofar as they are not technically mutually exclusive - in any combination with one another or with the previously mentioned developments, are set out in the following description of an embodiment and the associated drawing.

[0013] It shows: Fig. 1 a printing press with a sheet delivery in the scheme, Fig. 2 the bow boom in section in the Fig. 1 specified viewing direction II, Fig. 3 the bow boom in section in the Fig. 2 specified viewing direction III and Fig. 4 the bow boom in section in the Fig. 2 specified viewing direction IV.

[0014] A printing press 26 comprises printing units 27 for offset printing and a sheet delivery unit 28. A chain conveyor 29 and a powder sprayer 30 are arranged in the sheet delivery unit 28. The sheets printed in the printing units 27 are transported by the chain conveyor 29 past the powder sprayer 30, where they are dusted with powder. The chain conveyor 29 then transports the sheets 5 in a transport direction 34 to a stack 3, onto which the sheets 5 are deposited one after the other.

[0015] A lifting platform 31 comprises a platform 32 that supports the stack 3 and is suspended from pull chains 33. During printing, the lifting platform 31 lowers the platform 32 according to the increasing height of the stack 3, so that its top surface maintains a constant position. The top surface of the stack 3 forms a storage level 4 for the incoming sheets 5.

[0016] The lifting platform 31 and the stack 3 are arranged between a first wall 1 on the drive side of the printing press 26 and a second wall 2 on the operating side. A third wall 16 is arranged on the drive side above the first wall 1, and a fourth wall 17 is arranged on the operating side above the second wall 2. The lateral walls 1, 2 extend parallel to the transport direction 34. A transverse wall 20 extends orthogonally to the transport direction 34. A plate-shaped cover 41 is arranged above the transverse wall 20 and has a lower edge 42.

[0017] A housing 35 of the arched boom 28, which has the third wall 16 and the fourth wall 17, comprises columns 36, 37, 38, 39, which are in the Fig. 1 to 3 are only partially shown. The first wall 1 extends from column 36 to column 38, the second wall 2 extends from column 37 to column 39 and the transverse wall 20 extends from column 38 to column 39, as in Fig. 4 shown.

[0018] The first wall 1 has an upper edge 10, the second wall has an upper edge 11 and the transverse wall 20 has an upper edge 21. The third wall 16 has a lower edge 18 and the fourth wall 17 has a lower edge 19. The upper edges 10, 11, 21 and the lower edges 18, 19, 42 each run horizontally, with the upper edges 10, 11, 21 each lying below the storage level 4 and the lower edges 18, 19, 42 each lying above the storage level 4. A distance to be measured vertically between the upper edge 10 and the lower edge 18, as well as a distance to be measured vertically between the upper edge 11 and the lower edge 19, each lies in the range between 100 mm and 1000 mm, in particular in the range between 200 mm and 700 mm, preferably in the range between 300 mm and 500 mm, and can be, for example, approximately 400 mm. The specified distance on the drive side can be slightly larger than, slightly smaller than, or the same as the specified distance on the operating side.

[0019] Between the first wall 1 and the second wall 2, a fan system 40 is arranged, consisting of several rows of fans and oriented toward the stacking level 4. The fan system 40 blows from above onto the respective sheet 5 above the stack 3 to accelerate its descent onto the stack 3.

[0020] One side surface of the stack 3 and the first wall 1 define a first intermediate space 6, and the other side surface of the stack 3 and the second wall 2 define a second intermediate space 7. A third intermediate space 22 is defined by the front side of the stack 3 and the transverse wall 20.

[0021] The third wall 16 is provided on its underside with a first blowing orifice 12 in the form of a long slot, which runs parallel to the lower edge 18 and is approximately as long as the upper edge 10. The fourth wall 17 is provided on its underside with a second blowing orifice 13 in the form of a long slot, which runs parallel to the lower edge 19 and is approximately as long as the upper edge 11. A third blowing orifice 24 in the form of a long slot is incorporated into the cover 41, which runs parallel to the lower edge 42 and is approximately as long as the upper edge 21. The long slots form flat jet nozzles or air knives. Instead of the long slots forming the blowing orifices 12, 13, 24, a row of nozzle bores or short nozzle slots can also be provided, which together form an air doctor blade.

[0022] The first blower outlet 12 blows a blower air curtain 14 into the first intermediate space 6. For this purpose, the first blower outlet 12 can be arranged horizontally offset relative to the first wall 1 relative to the stack 3 and / or have a blowing direction slightly inclined toward the stack 3. In an analogous manner, the second blower outlet 13 can blow a blower air curtain 15 into the second intermediate space 7 and the third blower outlet 24 can blow a blower air curtain 25 into the third intermediate space 22. The blower air curtains 14, 15, 25 form barriers that prevent stray powder, released during dusting of the sheets 5, from escaping from the housing 35 into the environment.

[0023] A first extraction port 8 is located in the lower area of ​​the first intermediate space 6, a second extraction port 9 is located in the lower area of ​​the second intermediate space 7, and a third extraction port 23 is located in the lower area of ​​the third intermediate space 22. The extraction ports 8, 9, 23 serve to extract the powder-laden air from the intermediate spaces 6, 7, 22, which is forced by the blown air curtains 14, 15, 25 to the extraction ports 8, 9, 23.

[0024] The suction outlets 8, 9, 23 can be connected to one or more suction air generators via lines, e.g., with an interposed powder filter. Alternatively, fans can be installed in the suction outlets 8, 9, 23 to generate the suction air. The suction outlets 8, 9, 23 can each be designed as a long slot running parallel to the associated blow outlet 12, 13, 24. Instead of the nozzle slots forming the suction outlets 8, 9, 23, a row of nozzle holes or short nozzle slots can also be provided.

[0025] According to a variant not shown in the drawing, the suction outlets 8, 9, 23 can be sections of a single suction outlet which in the plan view ( Fig. 4) U-shaped around three sides of stack 3.

[0026] The diagram shows a variant in which an extraction duct in the form of a square hollow profile is arranged in the corner between the respective wall 1, 2, 20 and the floor. The respective extraction opening 8, 9, 23 is incorporated into the upwardly facing roof surface of the extraction duct, and another extraction opening is incorporated into the side surface of the extraction duct facing stack 3. This opening serves to extract air from the area below the platform 32.

[0027] Advantageously, despite their barrier effect, the air curtains 14, 15, and 25 do not obstruct the operating personnel's view of the stacking level 4, allowing any malfunctions during stacking to be detected in a timely manner. Furthermore, the air curtains 14, 15, and 25 allow easy access from the outside into the housing 35, e.g., for sample sheet removal. List of reference symbols 1 first wall 2 second wall 3 stacks 4 storage levels 5 sheets 6 first space 7 second space 8 first suction port 9 second suction port 10 Top edge 11 Top edge 12 first blowing mouth 13 second blowing orifice 14 Blown air curtain 15 Blown air curtain 16 third wall 17 fourth wall 18 bottom edge 19 bottom edge 20 cross wall 21 top edge 22 third space 23 third suction port 24 third blowing orifice 25 blown air curtain 26 printing press 27 printing unit 28 bow booms 29 chain conveyors 30 powder dusters 31 lifting platform 32 Platform 33 Pull chain 34 Transport direction 35 housings 36 Column 37 Column 38 Column 39 Column 40 fan system 41 Cover 42 bottom edge 11 Direction of view III Viewing direction IV Viewing direction QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 197 53 890 C1

[0003] DE 10 2007 003 880 A1

[0004]

Claims

[1] Sheet delivery of a printing press, comprising a first wall (1) and a second wall (2), between which a stack (3) is arranged, which forms a storage level (4) for sheets (5), wherein between the stack (3) and the first wall (1) and between the stack (3) and the second wall (2) there is a first intermediate space (6) and a second intermediate space (7), to which at least one first suction outlet (8) and at least one second suction outlet (9) are assigned, characterized by , that the first wall (1) and the second wall (2) each have an upper edge (10, 11) which is located below the storage level (4), that the first suction opening (8) and the second suction opening (9) are arranged below the upper edges (10, 11) of the first wall (1) and the second wall (2) or not higher than the upper edges (10, 11), that at least one first blowing orifice (12) and at least one second blowing orifice (13) are arranged above the storage level (4) or in the region of the storage level (4), and that the first blowing orifice (12) and the second blowing orifice (13) are oriented to expel blowing air curtains (14, 15) into the first intermediate space (6) and the second intermediate space (7). [2] Sheet delivery device according to claim 1, characterized by that the first blowing orifice (12) and the second blowing orifice (13) are arranged on a third wall (16) and a fourth wall (17), between which fans (18) are arranged, the air flows (19) of which are directed onto the storage level (4), and that the third wall (16) and the fourth wall (17) each have a lower edge (18, 19) which is located above the storage level (4). [3] Sheet delivery device according to claim 1, characterized by , that the first wall (1) and the second wall (2) are arranged together with a transverse wall (20) in a U-shape, that the transverse wall has an upper edge (21) which is located below the storage level (4), that between the stack (3) and the transverse wall (20) there is a third intermediate space (22) to which at least one third suction outlet (23) is assigned, and that above the storage level (4) there is arranged at least one third blow outlet (24) which is oriented to expel a blow air curtain (25) into the third intermediate space (22). [4] Sheet delivery device according to claim 3, characterized by that the third blowing orifice (24) is a blowing slot nozzle or is part of a blowing nozzle row. [5] Sheet delivery device according to one of claims 1 to 4, characterized by that the first blowing orifice (12) and the second blowing orifice (13) are each a blowing slot nozzle or are part of a blowing nozzle row.

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