JPH10226046A - Dust removing mechanism with sheet paper guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guide sheet papers before a dust remover and a printing region uniformly an arrangement wherein a blow tube arranged on the upstream side of a dust removing mechanism is provided with an opening directed reversely to the carrying direction and generates an air blow directed toward a region for transferring to an impression cylinder in the blow direction. SOLUTION: When viewed in the carrying direction 13, the dust removing mechanism comprises a blow tube 4 arranged in parallel with the axis of an impression cylinder 2 while opening to generate a blow air for a transfer region and a print product being guided by the impression cylinder 2, an ionization unit 8, a dust removing unit 5, and a single sheet feeder 6. A blow air flowing out from the blow tube 4 in the blow direction 11 flows reversely to the carrying direction 13 thus generating a force acting on the print product. Consequently, intrusion of ambient air to the underside of the print product is prevented in early stage and the print product is guided onto a plane at the circumferential wall of the impression cylinder 2. After passing through the transfer region, the blow air flows over a defined arcuate section toward the print product being guided on the impression cylinder 2 with a gripper being closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust-removing mechanism with a sheet guide for a rotary printing press of the type described in the preamble of claim 1.

[0002]

2. Description of the Related Art A device of the above type is known from Swiss patent 41.
9188. The known invention relates to a device for scraping dust from the surface of the paper to be printed as well as for brushing and sucking it, wherein the device is arranged upstream of the printing zone in the sheet transport direction. I have. The suction unit is embodied as an oscillating suction beam, which has a brush in the end region, is arranged in a swivel support and is freely extractable upward from the printing unit.

A disadvantage of the known device is that the sheet guide can hardly consider the different weights per unit area of the sheet to be processed.

[0004] From German Patent DE 39 20 730 A1 a sheet guide device for feeding a printed sheet smoothly upstream of a printing nip is known. Accordingly, a blow nozzle is provided for pressing the sheet to the peripheral wall of the drum by the action of the flowing air, and the blow nozzle is supported so as to be able to reciprocate in parallel to the axis of the impression cylinder, and The sheet can be moved forward or backward in the sheet conveying direction at the operation timing of the printing press.

In this case, the construction of the transmission technology for achieving the oscillating movement of the sheet guide device has a disadvantageous effect on the structural space before the printing nip.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to obviate the above-mentioned disadvantages and to achieve a uniform guiding of the sheet in the impression cylinder, in particular before the dust-removing mechanism and before the printing zone, and to provide a printed product. It is an object of the present invention to provide a dust removing mechanism provided with a sheet guide device that can purify the dust.

[0007]

According to the present invention, the above-mentioned object has been achieved by the structure of the present invention described in the characterizing part of Claim 1.

[0008] Advantageous configurations are set out in the further claims.

[0009]

An advantage of the present invention is that it significantly reduces the occurrence of air cushions between the sheet-like printed product and the impression cylinder, thereby reducing the weight of the sheet-like printed product substantially by the unit area of the printed product. Independently, it can be guided in a plane immediately after the transfer area for the impression cylinder. The printed product comes into flat contact with the peripheral wall of the impression cylinder, in which case the activated dedusting mechanism does not adversely affect the guide of the printed product on the impression cylinder.

Furthermore, in the device according to the invention, the fluttering or bleeding (Abklatschen) which occurs in the case of a corrugated sheet-like printed product on the dust-removing mechanism or on the sheet-feeding device or on the rubber blanket cylinder itself, as well as on the rear printed product. The folding (offset doubling = Vorlaufdoublieren) which occurs in the case of corners is avoided.

The arrangement of the dust removal mechanism with the sheet guide device can advantageously be used for a feed printing unit (of the first printing unit in the transport direction of the printed product).
However, the invention is not limited to such use, but rather is also suitable for printing units following the turning device in the transport direction, as well as for the upstream arrangement of a subsequent processing unit, for example a varnishing unit. Alternatively, a downstream arrangement of a dusting device, for example a powder spray mechanism, is also possible.

[0012]

FIG. 2 shows a rotary printing press for processing printed products in the form of sheets, for example paper, cartons, foils and sheets. Further, FIG. 2 shows a sheet feeding device 18 having two printing units 16 and a supply table 19 in a row type structure. Each printing unit 16 has, in a known manner, an impression cylinder 2, a blanket cylinder 1 and a plate cylinder 14, to which an ink unit and possibly a dampening unit are assigned. A transfer drum 15 is arranged between the impression cylinders 2. In the area 20 formed by the impression cylinder 2, the rubber blanket cylinder 1 and the feed drum 3 arranged in front of them, an advantageous structure according to the invention is arranged. In this case, the transport direction 1 of the sheet-shaped printed product
1, the apparatus according to FIG. 1 comprises a blow tube 4 arranged axially parallel to the axis of the impression cylinder 2, an ionizer 8 extending axially parallel to the impression cylinder 2; It comprises a dust removing mechanism 5 arranged parallel to the axis and a sheet feeder 6 arranged substantially parallel to the peripheral wall of the impression cylinder 2.

[0013] The blow tube 4 is provided with an opening through which the blow air flows out, the blow air preferably being in the blow direction 1.
1 flows out almost in the direction opposite to the transport direction 13. In this case, the openings are arranged in such a way that a flow of blown air to the transfer area and a flow of blown air to the printed product guided by the impression cylinder 2 occur. In another configuration, at least two rows of openings having a flow direction 11 are arranged in a blow tube 4 extending over the width of the impression cylinder, the first row of openings being blown in the direction of the transfer area. The air flow and the second row of openings generate a blow air flow in the direction of the peripheral wall of the impression cylinder 2.

The dust removing mechanism 5 is substantially composed of a suction box, and brushes arranged in the lower and upper restriction portions of the suction box. The brush is arranged at a prescribed distance from the peripheral wall of the impression cylinder 2. The dust removing mechanism 5 is movable in the longitudinal direction within a guide 12 disposed substantially at right angles to the peripheral wall of the impression cylinder 2.
Is precisely adjustable. Guide 1 at the same time
2 also serves to attach or remove the dust removal mechanism from the printing unit 16 in the predetermined area 20. The dust removal mechanism 5 is connected to a pneumatic system, preferably a suction source, for removing dust or powder from the printed product surface in the suction direction 9.

The sheet feeder 6 comprises a closed blow box having an opening through which blow air flows. The blowing direction 10 is directed to the printing nip (formed by the impression cylinder 2 and the blanket cylinder 1) on the peripheral wall of the impression cylinder 2 and preferably in the transport direction 13. The design of the sheet feeder 6 is such that the area facing the print nip is strongly curved and thus reaches close to the printing zone. Furthermore, the sheet feeder 6
Are pivotally supported on the peripheral wall of the impression cylinder 2 over a specified angle in a rotating link 7 fixedly arranged on the frame.

The mode of operation is as follows.

The sheet-shaped printed product is transferred from the sheet feeding device 18 via the supply table 19 in the right and left registration direction 1
The swing gripper 17 supplies the print product to the paper feed drum 3.
The feed drum 3 receives the print product, accelerates it to machine speed, and delivers the print product to the first printing unit 16 in the delivery area.
Hand over to the impression cylinder 2.

In the transfer area 20 (from the feed drum 3 to the impression cylinder 2), the blow air flowing out of the activated blow pipe 4 in the blowing direction 11 flows in a direction substantially opposite to the conveying direction 13 and prints the printed product. To generate force acting on
In this way, the intrusion of the ambient air into the underside of the printed product is prevented early, so that the printed product is guided flatly (smoothly) on the peripheral wall of the impression cylinder 2. Furthermore, after passing through the transfer area, the blown air flows over the defined arc section towards the printed product guided on the plate cylinder 2 with the gripper closed.

The printed product passes through an ionizer 8 which removes any obstructive electrostatic charges which may occur in the case of dust or powder particles. The energy balance is regained by removing the electrostatic charge. Dust or powder is sucked out of the surface of the printed product by the dust removing mechanism 5 in the sucking direction 9 and supplied to the receiving container. The printed product is transported through a dust removal mechanism 5, expanded and passes through a sheet feeder 6.

The sheet feeder 6 can be configured as a sheet guide rod or a sheet guide sheet which is spaced over the width of the impression cylinder 2. Preferably, however, the sheet feeder 6 is configured as a blow box with an opening through which the blown air flows out. In this case, the blown air flows from the blow box in the blow direction 10 to the impression cylinder 2.
And preferably also in the direction of the printing zone. In addition, the blown air stream can be directed to the rubber blanket cylinder 1 via a suitable opening and flow together in the direction of the printing zone by the drag flow of the rubber blanket cylinder.

The blow air is diverted in the region of the printing zone and flows in a direction opposite to the direction of transport 13 of the printed product. The printed product is additionally guided in the impression cylinder 2 in a planar manner. The blown air flow diverted before or in the printing zone is partially sucked out by the dedusting mechanism 5. Furthermore, the sheet feeder 6 is pivotable in a rotary link 7 which is arranged stationary on the frame.

In the case of processing a sheet-shaped printed product having a small weight per unit area, the sheet feeding device 6 is arranged such that the area adjacent to the printing zone in the transport direction 13 is larger than the area adjacent to the dust removing mechanism 5. Are also inclined so as to have a slight distance from the peripheral wall of the impression cylinder. In the case of processing a sheet-shaped printed product having a large weight per unit area, for example, a material having a bending rigidity, the sheet feeding device 6 has an area adjacent to the printing zone in the transport direction 13 adjacent to the dust removing mechanism 5. It is inclined so as to have a larger distance from the peripheral wall of the impression cylinder than the region. The advantage of this is that the printed product is guided along the sheet feeder 6 at the trailing edge in order to prevent possible curling in the rear area of the printed product.

After passing through the printing zone from the impression cylinder 2 of the first printing unit 16, the printed product is delivered to a subsequent transfer drum 15 and then conveyed to a subsequent second printing unit 16.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a dust removing mechanism including a sheet guide device.

FIG. 2 is a diagram showing an arrangement format of a printing unit before a printing nip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber blanket cylinder 2 Impression cylinder 3 Feed drum 4 Blow tube 5 Dust removal mechanism 6 Sheet feeder 7 Rotating link 8 Ionizer 9 Suction direction 10, 11 Blow direction 12 Guide 13 Transport direction 14 Plate cylinder 15 Transfer drum 16 Printing Unit 17 Swing gripper 18 Paper feeder 19 Supply table 20 Area

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Thomas Walter, Inventor Offenbatsch Hermann-Steinhauser-Strasse 6, Germany 6 (72) Inventor Oud Trilich Offenbatsch Wengertstraße, Germany 5

Claims (9)

[Claims] 1. A dust removing mechanism provided with a sheet guide device of a rotary printing press, wherein the sheet guide device is disposed on an upstream side of a printing zone when viewed in a conveying direction of a print product. In a type in which the dust removing mechanism is configured as a suction box provided with brushes in at least an upper region and a lower region and is connected to a suction air source, the dust removing mechanism (5) is viewed in the transport direction (13). On the upstream side, extending across the impression cylinder peripheral wall parallel to the axis of the impression cylinder (2);
At least one blowpipe (4) connected to the pneumatic system is arranged, said blowpipe having an opening oriented in the opposite direction to said transport direction (13), whereby the blow direction Oriented at (11) to the peripheral wall of the impression cylinder (2) and located upstream of said impression cylinder;
A dust removal mechanism with a sheet guiding device, characterized in that a blown air stream (2) is generated which is directed to the transfer area to the impression cylinder. 2. A blow tube (4) having at least two rows of openings arranged in such a manner that the first row of openings is in the direction of the transfer area and the second row of openings is of the impression cylinder peripheral wall. 2. The dust removing mechanism according to claim 1, wherein each of the arc sections generates a force due to a blown air flow. 3. An ionizer (8) is arranged between the blow pipe (4) and the dust removal mechanism (5) and extends across the width of the impression cylinder in a direction parallel to the axis of the impression cylinder (2). The dust removing mechanism according to claim 1, wherein 4. The dust removal mechanism according to claim 1, wherein a sheet feeder (6) is arranged between the printing zone and the dust removal mechanism (5). 5. The dust-removing mechanism according to claim 4, wherein the sheet feeder is formed from individual guide rods or guide sheets. 6. The sheet feeding device (6) is configured as a blow box having an opening through which a blow air stream flows out in a blowing direction (10), and is arranged in a blowing direction (10).
The dust removal mechanism according to claim 4, wherein the at least one is directed to at least a peripheral wall of the impression cylinder (2). 7. A blowing air stream directed in the blowing direction (10) to the printing zone and diverted in a direction opposite to the conveying direction (13) to scrape the printed product on the impression cylinder (2). 7. The dust removing mechanism according to claim 6, wherein 8. A blow air stream is directed in a blow direction (10) to a rubber blanket cylinder (1) and is directed to a printing zone by a drag flow of the rubber blanket cylinder (1). 8. The dust-removing mechanism according to claim 7, wherein the blown air flow is diverted in a direction opposite to the conveying direction (13) into the printing zone so as to scrape the printed product on the impression cylinder (2). 9. A sheet feeder (6) is fixedly mounted on the frame and pivotably mounted in a rotary link (7).
The dust removing mechanism according to claim 4.