Paper collector of printing machine

Abstract

The invention relates to a paper collector of a printing press, comprising a first wall and a second wall between which a stack is arranged, which stack forms a placement plane for sheets, wherein a first intermediate space and a second intermediate space are provided between the stack and the first wall and between the stack and the second wall, at least one first suction opening and at least one second suction opening being associated with the first intermediate space and the second intermediate space. The first wall and the second wall each have an upper edge located below the placement plane. The first suction port and the second suction port are arranged below or not higher than the upper edges of the first wall and the second wall. At least one first mouthpiece and at least one second mouthpiece are arranged above the placement plane or in the region of the placement plane. And the first blowing opening and the second blowing opening are used for directionally spraying an air blowing curtain into the first intermediate space and the second intermediate space.

Description

Technical Field

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

[0002] The delivery is equipped with a barrier and suction device to prevent or at least minimize the escape of air contaminated by the loose powder into the environment. One problem is that the walls of the barrier device affect the visibility and accessibility of the sheet stack.

[0003] DE 197 53 890 C1 describes a delivery in which a stack of sheets is located in a chamber which is closed on four sides, wherein the upper edge of the chamber wall projects beyond the stack.

[0004] DE 10 2007 003 880 A1 describes a delivery in which a suction opening is arranged in the region of the lower edge of the stack. Summary of the invention

[0005] The object of the present invention is to provide an operator-friendly delivery.

[0006] The present invention solves the above-mentioned task by a paper delivery device of a printing press, which comprises a first wall and a second wall, a stack is arranged between the first wall and the second wall, and the stack forms a placement plane for the sheets, wherein there is a first intermediate space and a second intermediate space between the stack and the first wall and between the stack and the second wall, and the first intermediate space and the second intermediate space are provided with at least one first suction port and at least one second suction port, characterized in that the first wall and the second wall respectively have an upper edge located below the placement plane; the first suction port and the second suction port are arranged below the upper edge of the first wall and the second wall or not higher than the upper edge; at least one first blowing port and at least one second blowing port are arranged above the placement plane or in the area of ​​the placement plane; the first blowing port and the second blowing port spray the blowing curtain into the first intermediate space and the second intermediate space in a directed manner.

[0007] The delivery device of the present invention is user-friendly, wherein the placement plane can be easily seen and approached through the air blowing curtain. Since the upper edges of the first wall and the second wall are located below the placement plane, visibility and accessibility are not hindered.

[0008] The following embodiments of the present invention may be implemented individually or in combination with one another if they are not technically exclusive:

[0009] The first blowing port and the second blowing port may be arranged on the third wall and the fourth wall, a fan is arranged between the third wall and the fourth wall, and the airflow of the fan is directed toward the placement plane. The third wall and the fourth wall may respectively have a lower edge located above the placement plane.

[0010] The first wall and the second wall are arranged together with a transverse wall to form a U-shape. The transverse wall may have an upper edge located below the placement plane.

[0011] There is a third intermediate space between the stack and the transverse wall, to which at least one third suction opening is assigned. At least one third blowing opening can be arranged above the placement plane, which directs the blowing curtain into the third intermediate space.

[0012] The first blowing opening, the second blowing opening and / or the third blowing opening can each be a blowing slit nozzle or a component of a row of blowing nozzles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Further developments emerge from the following description of the exemplary embodiments and the figures, which can be realized individually or in any desired combination with one another (as long as they are not technically exclusive) or in combination with the developments already mentioned above.

[0014] In the attached figure:

[0015] Figure 1 A schematic diagram showing a printing press with a delivery;

[0016] Figure 2 by Figure 1 The view direction II given in FIG. 1 shows a cross-sectional view of the paper delivery device;

[0017] Figure 3 by Figure 2 The view direction III given in FIG. 1 shows a cross-sectional view of the delivery device; and

[0018] Figure 4 by Figure 2 The view direction IV given in FIG. 1 shows a cross-sectional view of the delivery device. DETAILED DESCRIPTION

[0019] The printing press 26 comprises a printing unit 27 for offset printing and a delivery 28. A chain conveyor 29 and a powder spreader 30 are arranged in the delivery 28. The sheets printed in the printing unit 27 are conveyed by the chain conveyor 29 through the powder spreader 30 and are sprinkled with powder by the powder spreader. The chain conveyor 29 then conveys the sheets 5 in a conveying direction 34 to the stack 3, on which the sheets 5 are stacked one after another.

[0020] The lifting platform 31 comprises a platform 32 which carries the stack 3 and is suspended on a drag chain 33. During printing operation, the lifting platform 31 lowers the platform 32 as the height of the stack 3 increases, so that the upper side of the stack remains in a constant position. The upper side of the stack 3 forms a placement surface 4 for incoming sheets 5.

[0021] The lifting platform 31 and the stack 3 are arranged between the first wall 1 on the drive side and the second wall 2 on the operating side of the printing press 26. The third wall 16 is arranged above the first wall 1 on the drive side, and the fourth wall 17 is arranged above the second wall 2 on the operating side. The side walls 1, 2 are parallel to the conveying direction 34. The transverse wall 20 is orthogonal to the conveying direction 34. A plate-shaped cover 41 is arranged above the transverse wall 20 and has a lower edge 42.

[0022] The housing 35 of the delivery receptacle 28 having the third wall 16 and the fourth wall 17 includes pillars 36, 37, 38, 39 which are arranged at the sides of the delivery receptacle 28. Figures 1 to 3 The first wall 1 extends from the column 36 to the column 38, the second wall 2 extends from the column 37 to the column 39, and the cross wall 20 extends from the column 38 to the column 39. Figure 4 shown.

[0023] 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 extend horizontally, wherein the upper edges 10, 11, 21 are each located below the placement plane 4 and the lower edges 18, 19, 42 are each located above the placement plane 4. The distance measured in the vertical direction between the upper edge 10 and the lower edge 18 and the distance measured in the vertical direction between the upper edge 11 and the lower edge 19 are both 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, for example, can be about 400 mm. The above distance on the drive side can be slightly larger or slightly smaller than the above distance on the operating side or the same as the above distance on the operating side.

[0024] A fan system 40 is arranged between the first wall 1 and the second wall 2, which consists of several rows of fans and faces the placement plane 4. The fan system 40 blows from above to the corresponding sheets 5 above the stack 3 to accelerate their descent onto the stack 3.

[0025] One side of the stack 3 and the first wall 1 define a first intermediate space 6, and the other side 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.

[0026] The third wall 16 is provided on its lower side with a first mouthpiece 12 in the form of an elongated slit, which extends parallel to the lower edge 18 and is approximately the same length as the upper edge 10. The fourth wall 17 is provided on its lower side with a second mouthpiece 13 in the form of an elongated slit, which extends parallel to the lower edge 19 and is approximately the same length as the upper edge 11. A third mouthpiece 24 in the form of an elongated slit is provided in the cover 41, which extends parallel to the lower edge 42 and is approximately the same length as the upper edge 21. The elongated slit forms a flat jet nozzle or an air knife. Instead of the elongated slits forming the mouthpieces 12, 1324, a row of nozzle holes or short nozzle slits can also be provided, respectively, which together form an air knife.

[0027] The first blow opening 12 blows a blow air curtain 14 into the first intermediate space 6. To this end, the first blow opening 12 can be arranged horizontally offset toward the stack 3 relative to the first wall 1 and / or have a blowing direction slightly inclined toward the stack 3. Similarly, the second blow opening 13 can blow a blow air curtain 15 into the second intermediate space 7, and the third blow opening 24 can blow a blow air curtain 25 into the third intermediate space 22. These blow air curtains 14, 15, 25 form a barrier that prevents loose powder or free powder released when the sheets 5 are spread from the housing 35 to the environment.

[0028] A first suction port 8 is arranged in the lower area of ​​the first intermediate space 6, a second suction port 9 is arranged in the lower area of ​​the second intermediate space 7, and a third suction port 23 is arranged in the lower area of ​​the third intermediate space 22. The function of these suction ports 8, 9, 23 is to suck out the air loaded with powder from the intermediate spaces 6, 7, 22, and the air is blown toward the suction ports 8, 9, 23 by the blowing curtains 14, 15, 25.

[0029] These suction openings 8, 9, 23 can be connected to one or more suction generators via pipes, for example with a powder filter connected in the middle; alternatively, a fan generating suction can be placed in the suction openings 8, 9, 23. Each suction opening 8, 9, 23 can be designed as a long slit extending parallel to the associated blowing opening 12, 13, 24. Instead of forming nozzle slits of the suction openings 8, 9, 23, a row of nozzle holes or short nozzle slits can also be provided respectively.

[0030] According to a variant not shown in the figure, the suction openings 8, 9, 23 can be sections of a single suction opening, which in top view ( Figure 4 ) extends in a U-shape around three sides of the stack.

[0031] A variant is shown in which a suction channel in the form of a square hollow profile is arranged at the corner between the respective wall 1, 2, 20 and the bottom or floor. The respective suction opening 8, 9, 23 is arranged on the upper surface of the suction channel facing upwards and another suction opening is arranged on the side of the suction channel facing the stack 3, the function of which is to suck air out of the area below the platform 32.

[0032] Advantageously, although the air curtain has a barrier effect, the air curtain 14, 15, 25 does not hinder the operator from observing the placement plane 4, so that interference in the placement process can be recognized in time. In addition, the air curtain 14, 15, 25 also allows easy access or intervention from the outside of the housing 35, for example, for removing a sample.

[0033] Reference numerals list

[0034] 1First Wall

[0035] 2 Second Wall

[0036] 3 stacks

[0037] 4 Place the plane

[0038] 5 pages

[0039] 6The First Intermediate Space

[0040] 7 The Second Intermediate Space

[0041] 8First suction

[0042] 9 Second suction port

[0043] 10 Upper edge

[0044] 11 Upper edge

[0045] 12 First Mouthpiece

[0046] 13 Second Mouthpiece

[0047] 14 Air curtain

[0048] 15 The Third Wall

[0049] 16 The Fourth Wall

[0050] 17 Lower edge

[0051] 18 Lower edge

[0052] 20 horizontal wall

[0053] 21 Top edge

[0054] 22 The Third Intermediate Space

[0055] 23 Third suction port

[0056] 24 Third Mouthpiece

[0057] 25 Air curtain

[0058] 26 Printing Press

[0059] 27 printing units

[0060] 28 Paper delivery

[0061] 29 Chain conveyor

[0062] 30 Powder Spreader

[0063] 31 Lifting platform

[0064] 32 Platforms

[0065] 33 Drag chain

[0066] 34 Conveying direction

[0067] 35 Shell

[0068] 36 columns

[0069] 37 columns

[0070] 38 columns

[0071] 39 columns

[0072] 40 Fan System

[0073] 41 Lid

[0074] 42 bottom edge

[0075] II View Direction

[0076] III View Direction

[0077] IV View direction.

Claims

1. A paper delivery device of a printing press, comprising a first wall (1) and a second wall (2), between which a stack (3) is arranged, the stack forming a placement plane (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), the first intermediate space and the second intermediate space being provided with at least one first suction opening (8) and at least one second suction opening (9), characterized in that: The first wall (1) and the second wall (2) respectively have upper edges (10, 11) located below the placement plane (4); The first suction port (8) and the second suction port (9) are arranged below or not higher than the upper edges (10, 11) of the first wall (1) and the second wall (2); At least one first mouthpiece (12) and at least one second mouthpiece (13) are arranged above the placement plane (4) or in the region of the placement plane (4); and The first blowing port (12) and the second blowing port (13) spray blowing air curtains (14, 15) into the first intermediate space (6) and the second intermediate space (7) in a directed manner.

2. The paper delivery device according to claim 1, characterized in that: The first blowing port (12) and the second blowing port (13) are arranged on a third wall (16) and a fourth wall (17), a fan (18) is arranged between the third wall and the fourth wall, and an airflow (19) of the fan is directed toward the placement plane (4); and The third wall (16) and the fourth wall (17) each have a lower edge (18, 19) located above the placement plane (4).

3. The paper delivery device according to claim 1, characterized in that: The first wall (1) and the second wall (2) are arranged together with a transverse wall (20) to form a U shape; The transverse wall has an upper edge (21) located below the placement plane (4); A third intermediate space (22) is provided between the stack (3) and the transverse wall (20), and at least one third suction opening (23) is provided to the third intermediate space; and At least one third blowing opening (24) is arranged above the placement plane (4), and the third blowing opening sprays a blow air curtain (25) into the third intermediate space (22) in a directed manner.

4. The paper delivery device according to claim 3, characterized in that: The third blowing port (24) is a blowing slit nozzle or a component of a row of blowing nozzles.

5. The paper delivery device according to any one of claims 1 to 4, characterized in that: The first blowing opening (12) and the second blowing opening (13) are respectively components of a blowing slit nozzle or a row of blowing nozzles.

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