Paper collecting device

Abstract

A paper collecting device (2) of a printing press comprises a separating device which is formed by air jets (14) located on the drive side (AS) and on the operating side (BS), respectively, said air jets pointing from bottom to top towards a suction device (17) and forming a pneumatic barrier in the upper region of the opening. The air jet (14) is ejected from a shielding device (5) which forms a barrier in the lower region of the opening.

Description

Technical Field

[0001] The invention relates to a paper delivery device of a printing press, which comprises an isolation device. Background Art

[0002] DE102008025403A1 describes a delivery device in which an upper suction transverse channel is constructed in the area upstream of the chain deflection portion. The air curtain generated by the blower is blown off in a targeted manner so that it flows into the upper suction transverse channel. Summary of the Invention

[0003] The object of the present invention is to provide a further delivery device of a printing press.

[0004] The object is achieved by a paper delivery device of a printing press, which includes an isolation device, characterized in that the isolation device is formed by air jets located on the drive side and the operating side, respectively, the air jets are directed from bottom to top toward the suction device and form a pneumatic barrier in the upper area of ​​the opening, and the air jets are ejected from a shielding device, which forms a barrier in the lower area of ​​the opening.

[0005] The delivery device according to the invention is advantageously designed with respect to sheet placement or sheet storage.

[0006] Expansion plans can be:

[0007] There can be a bracket for inserting the shielding device into the opening and removing the shielding device from the opening without tools. The bracket can be composed of a sleeve on the shielding device and a tenon on the ground.

[0008] There may be a locking device for inserting the shield device into the opening and removing the shield device from the opening without tools. The locking device may have a locking bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Developments will emerge from the following description of exemplary embodiments and the accompanying drawings.

[0010] In the attached figure:

[0011] Figure 1 A side view showing the delivery device, and

[0012] Figure 2 Schematic diagram showing the air movement in the paper delivery device. DETAILED DESCRIPTION

[0013] Figure 1 The stacking module 1 of the delivery of a printing press 2 is shown. Printed sheets are transported into the stacking module 1 along a sheet transport direction 3 .

[0014] Figure 2 from Figure 1 The illustrated viewing direction II schematically shows the stacking module 1. The figure also shows a sheet stack 4. The printing press has a drive side AS and a control side BS.

[0015] from Figure 1 and Figure 2 It can be seen that a shielding device 5 is arranged on each AS, BS side, which shielding device serves to partially close the opening 6 in the stacking module 1. The shielding device 5 is a plate and can be double-walled.

[0016] The corresponding shielding device 5 can be removed and inserted as needed. The shielding device 5 is equipped with a sleeve 7 at the bottom, which is inserted into the tenon 8 of the tenon 9 when the shielding device 5 is inserted into the opening 6. The sleeve 7 is height-adjustable, for example by means of a thread, to compensate for tolerances and adjust the shielding device 5 to its correct height.

[0017] The sleeve 7 and the tongue 8 are arranged in a flat depression 11 which is recessed into the floor (or base) 10. Since the support, in particular the tongue 8, is sunk into the floor 10, the sheet stack 4 can be removed from the stacking module 1 through the opening 6 without hindrance, for example by a lifting vehicle (or forklift) when the shielding device 5 is removed.

[0018] When the shielding device 5 is inserted, it is locked, for which purpose locking bolts 12 are arranged on its sides and engage with holes in the stacking module 1 .

[0019] An air knife or flat nozzle 13 is arranged on the upper side of the shielding device 5. An air jet 14 is ejected vertically upward from the slot of the air knife or flat nozzle. The air jet 14 ejected upward from the flat nozzle 13 extends across the entire width of the opening 6 in the sheet transport direction 3. The air jet 14 forms an air curtain that forms a barrier in the area of ​​the opening 6 not closed by the shielding device 5.

[0020] When dusting freshly printed sheets during printing, stray powder is inevitably released into the stacking module 1. The barrier formed by the air jet 14 prevents stray powder from escaping from the stacking module 1 through the opening 6 into the environment, contaminating the environment and posing a health hazard to the operator in the form of dust.

[0021] The flat nozzle 13 is supplied with blast air, such as compressed air, via an air channel (not shown) integrated into the shielding device 5. If the blast air has a relatively low pressure of 8 to 10 mbar, the slot width of the flat nozzle 13 can be in the range of 1 to 4 mm. If the blast air supplied to the flat nozzle 13 has a relatively high pressure of 100 to 200 mbar, the slot width of the flat nozzle 13 can be 0.05 to 0.10 mm.

[0022] The blast air is supplied to the shielding device 5 laterally via a feedthrough 15, which is arranged on a housing portion of the stacking module 1. This housing portion can be a shield or a column 16. When the shielding device 5 is placed into the opening 6, the opening of the air duct integrated into the shielding device 5 overlaps with the feedthrough 15, forming an air-conducting connection. The feedthrough 15 and / or the opening can be provided with an annular seal made of an elastomer or foam material to prevent the blast air flowing from the feedthrough 15 into the opening from escaping between the two adjacent components (the feedthrough 15 and the shielding device 5).

[0023] The blast air can be generated by a radial fan arranged inside the stacking module 1, for example in the area of ​​the stacking module above the columns 16. This decentralized air generation method is particularly energy-efficient. However, the blast air can also come from a central air source that supplies air to multiple air consumers in the printing press.

[0024] A suction device 17 is arranged at the upper edge of the opening 6 and has a length substantially the same as that of the flat nozzle 13. The suction device 17 has a slot or a row of holes serving as suction openings. In the example shown, the suction device 17 is designed as a suction strip. The suction device 17 is connected to a non-central or central vacuum source and is positioned relative to the flat nozzle 13 so that the air jet 14 strikes the suction device 17 or its downward-facing suction opening.

[0025] like Figure 2As shown, in the arrangement according to the present invention, a pneumatic powder barrier is formed by blowing air upward from below and sucking air from above. This arrangement advantageously supports the placement (or storage) of printed sheets 18 on the sheet stack 4. A vortex 19 is generated on both sides of the conically widening air jet 14. The figure shows the vortex 19 inside the machine. This vortex flows upward at the air jet 14 and downward at the sheet stack 4. Consequently, the downward-flowing air of the vortex 19 presses the printed sheets 18 from above, which have been released above the sheet stack 4 by the sheet transport system (e.g., a chain conveyor with a gripper bridge). This downward-flowing air thus supports the rapid descent of the printed sheets 18 onto the sheet stack 4. Increasing the sinking speed of the printed sheets 18 can increase the printing speed of the printing press, thereby improving productivity.

[0026] Reference Signs List

[0027] 1 stack module

[0028] 2Paper delivery device

[0029] 3 sheet feeding directions

[0030] 4-sheet stack

[0031] 5 shielding device

[0032] 6 openings

[0033] 7 sleeves

[0034] 8 tenons

[0035] 9 tenons

[0036] 10 Ground

[0037] 11 level settlement section

[0038] 12 Lock bolt

[0039] 13 flat nozzle

[0040] 14 Air Beam

[0041] 15 penetration device

[0042] 16 columns

[0043] 17 Suction device

[0044] 18 printed pages

[0045] 19 Eddy Current

[0046] AS drive side

[0047] BS operating side.

Claims

1. A paper delivery device (2) of a printing press, comprising an isolation device, characterized in that: The separating device is formed by air jets (14) on the drive side (AS) and the operating side (BS), which are directed from bottom to top toward the suction device (17) and form an aerodynamic barrier in the upper region of the opening (6), and The air jet (14) emerges from a shielding device (5) which forms a barrier in the lower region of the opening (6).

2. The paper delivery device according to claim 1, characterized in that: A holder is provided for inserting the shielding device (5) into the opening (6) and removing the shielding device (5) from the opening (6) without tools.

3. The paper delivery device according to claim 2, characterized in that: The bracket is composed of a sleeve (7) on the shielding device (5) and a tenon (8) on the ground (10).

4. The paper delivery device according to claim 1, characterized in that: A locking device is provided for inserting the shielding device (5) into the opening (6) and removing the shielding device (5) from the opening (6) without tools.

5. The paper delivery device according to claim 4, characterized in that: The locking device has a locking bolt (12).

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