JPH05254705A - Method and apparatus for continuously delivering sheet from sheet-fed printer - Google Patents

Abstract

PURPOSE: To prevent printing rub/adherence of a sheet in the case of piling by improving a means for continuously delivering the sheet of a sheet-fed printer. CONSTITUTION: A sheet fed from a gripper in a delivery unit 4 is guided through a suction unit 6 and a guide unit 7, brought at its edge into contact therewith at a predetermined angle α in a horizontal direction, an air cushion is formed between sheets 1 and received in a cassette 8 formed with partial piling 16. In this case, the cassette 8 is received in conveyors 13, 14. The air is supplied between the sheets 1 formed with the piling 16 through a blowing unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for continuously ejecting printed sheets conveyed by a gripping device and a conveying device from a sheet ejection device of a sheet-fed printing press. ..

[0002]

Various sheet ejection devices are known for sheet-fed printing machines, in which the printed sheet is conveyed from the printing device to the sheet ejection device by means of a gripping device or a conveying device.
And it is placed as a pile. The piles need to be replaced for the continuous transport of the sheets. DE-A 27 14 612 discloses an intermediate disc of an auxiliary pile device for pulling a full pile from a pile space by means of a fork-type carriage. Furthermore, it is known from DE-A-3304673 to use an auxiliary pile platform which is connected to a fastening device.

The disadvantage of the above-mentioned means is that this operation requires a relatively large amount of time, and that the print rubbing / adhesion of freshly printed sheets increases with increasing pile weight (contact pressure). The point is that it cannot be stopped.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to improve the means for ejecting sheets of a sheet-fed printing press to reduce the surface pressure during the stacking of sheets, and To prevent print rubbing / adhesion of sheets.

[0005]

According to the present invention, the above problems can be solved by the features described in claims 1 and 5.

[0006]

According to the means of the present invention, it is ensured that the sheets can be continuously discharged from the sheet-fed printing machine without adhering the sheets especially during high-speed operation of the machine. Has been done. The surface pressure perpendicular to the plane of the paper is very small because most of the gravity is supported by the edges of the sheet. The technically required consumption time for a conventional pile exchange can be dispensed with by means of the invention. Supplying an empty cassette to the paper discharge area and pulling out the cassette full of partial piles from the paper discharge area are other than the variations described in the embodiments, and are provided in an annular conveying device (for example, a merry-go-round carrier). It is also possible to use. Since the blowing device accelerates the sheet drying process, it can be arranged on both sides or below, depending on the respective requirements.

[0007]

EXAMPLES The present invention will be described in detail based on examples.

The printing sheet 1 is produced in a manner known from printing devices by means of an endless transport chain 3 and a gripping device.
It is conveyed into the area of the paper discharge device 4. After that, it is placed on the suction belt 5, braked via the suction device 6, and conveyed by the cam roller 9 driven synchronously via the guide device 7. Guidance device 7
Print sheet 1 with the help of
It is guided into the cassette 8 which forms an acute angle of ° and is slightly inclined. A synchronously driven cam roller 9 guides the starting part of the sheet above the preceding sheet already placed in the cassette 8. As a result, the printed sheet can edge-on on the sheet edge and slide on the air cushion to the bottom of the cassette without the surface contact of the preceding sheet. The air cushion which is built up as the printing sheet flows into the cassette 8 is additionally boosted by the blowing device 2. A large number of sheets arranged substantially parallel to each other are partially pulsed 16 in a filled cassette 8.
To form. The cassette 8 uses the pin 10 to carry the carry device 1.
In the inside of 1,12, the conveying devices 13 and 14 arranged horizontally
It is formally and releasably received by (for example, Chen). The cassette 8 is mainly composed of an L-shaped base body, which is tiltably inclined at an angle of about 80 ° with respect to the horizontal direction and is separably received in the transport devices 13 and 14. The blowing device 2 is arranged in the area of the paper discharge device 4 on the side of the cassette 8 forming the transport pile. Blowing device 2
The blown air generated by the is guided between the printing sheets 1 which form the partial pile 16 and are edge-on. The transport devices 13, 14 carry the cassette to be filled as well as the filled cassette 8 together with their partial pile 16 beside the blowing device 2 in the direction 15 synchronously.
Then, the cassette 8 is released from the entrainers 11 and 12, and the inclined position of the partial pile 16 is maintained by the moving carriage 17 moving on the rail 19 so that the conveying direction 1 can be maintained.
Take to 5. Subsequently, the upper portion 20 of the movable carriage 17
Is conveyed laterally on the rails 21 in the conveying direction 18 from the area of the paper delivery device 4 of the machine and the partial pile 16 received in the cassette 8 is fed to another processing device, for example a drying device. During this operation, the cassettes 8 arranged in series in the transport devices 13, 14 are transported further in the transport direction 15 depending on the speed and receive further partial piles. After the load is released, the empty cassette is fed for a new load operation.

[Brief description of drawings]

1 is a side view of a paper ejection device with cassettes arranged in series for receiving sheets in a paper ejection area. FIG.

FIG. 2 is a side view of a paper discharge device including a cassette pulled out from a paper discharge area.

FIG. 3 is a plan view of a paper discharge device including a cassette that is pulled out to the side.

[Explanation of symbols]

 1 Printing Sheet 2 Blowing Device 3 Conveying Chain 4 Paper Ejecting Device 5 Suction Belt 6 Suction Device 7 Guide Device 8 Cassette 9 Cam Roller 10 Pins 11, 12 Conveyor 13, 14 Conveying Device 15 Direction 16 Partial Pile 17 Moving Cart 18 Direction 19 rails 20 upper part of the moving carriage 21 rails α acute angle

Claims (7)

[Claims] 1. A method for continuously ejecting sheets from a sheet-fed printing press using a conveying and grasping device arranged in the ejecting device, each of which comes from the grasping device. The printed sheet (1) is guided via the suction device (6) and the guide device (7) and is edge-on at the sheet edge with an acute angle α with the horizontal direction, each printed sheet being While forming the air cushion between (1), the horizontal transfer device (13,
14) the printing sheet (1) is placed in a cassette (8) which is received in the cassette and is connected in series in a separable manner from the other cassettes (8) to receive one partial pile (16). It is characterized in that blown air is supplied synchronously between the sheets (1) which are stacked and which are separated by the air cushion in a substantially parallel manner to form a partial pile (16) in the discharge area. A method for continuously ejecting sheets from a sheet-fed printing press. 2. The filled cassette (8) is further transported in the direction (15) by the transport device (13, 14), and the paper discharge device (4) is oriented in the lateral direction (18). 2. The method according to claim 1, further comprising the step of further transporting the slanted position from the area to the outer side. 3. Sheet (1) is edge-on at the sheet edge in the longitudinal direction of the sheet and is accumulated in a cassette (8) forming a partial pile (16). The method according to claim 1 or 2. 4. Method according to claim 1, characterized in that blowing air is blown laterally between the sheets (1) separated by an air cushion in a velocity-dependent manner. 5. A horizontal transport device (13, 14) is arranged in the area of the paper discharge device (4) and its entrainer (1).
1, 12), at least one cassette (8) consisting of a substantially L-shaped base body and inclined at an acute angle α to the horizontal is dissociated by a pin (10) in a shape-coupling manner. 5. Device for carrying out the method according to claims 1 to 4, characterized in that the admitted device is provided and at least one blowing device (2) is arranged in the region of the output device. 6. Device according to claim 5, characterized in that the blowing device (2) is arranged at right angles to the conveying direction. 7. Device according to claim 5, characterized in that the cassettes (8) are linked by a ring carrier.