JPH0423005Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a sheet conveying device in a printing press.

[Conventional technology]

In a printing device, after sheets are transferred to a printing site and printed, each sheet is generally held immovably with a claw or the like and transferred until it is discharged.

[Problem that the invention attempts to solve]

In the above-mentioned conventional method in which the sheets are held and transported with claws, etc., the claws are exposed on the sheet surface, so when printing or painting is required on the entire surface of the sheet, the holding portion by the claws is exposed. It is unavoidable that the blank area remains as a blank, resulting in an inconvenience that reduces the printing effect.

[Means for solving problems]

The present invention eliminates the above-mentioned inconveniences caused by the conventional transport of sheet sheets, and makes it possible to hold and transport the sheet without creating even the slightest blank area when printing on the entire surface of the sheet, and allows it to be held and transported at regular intervals on the circumferential surface. A substantially circular arc shape that is in contact with the inner circumferential surface of a hollow rotating drum that has suction holes and has a number of continuous compartments in the circumferential direction, and each of the outer sides is open and communicates with the suction holes. A suction chamber is fixedly installed to communicate the inside of each compartment with a suction source, and a printing sheet supply part is provided outside the hollow rotary drum corresponding to the arc-shaped starting end of the suction chamber, and a circular-arc-shaped terminal end is provided. A discharge section for the printed sheets is provided in correspondence with the above, and a printing mechanism is provided at an intermediate portion between the supply section and the discharge section.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a hollow rotating drum with a plurality of suction holes 2 arranged at predetermined intervals on its circumferential surface, and a large number of compartments 4 are successively arranged in an arc along the inner circumferential surface of the drum. The outside of each compartment 4 is opened and communicated with the suction hole 2 of the rotary drum 1, and a nearly annular arc-shaped suction chamber 3 is fixedly installed, and the rotary drum 1 is attached to the open outer peripheral surface of the arc-shaped suction chamber 3. I made it touch and rotate. In addition, in the illustrated example, a large number of branch rooms 4a
The individual divided chambers 4a are arranged in an arc shape, and each compartment 4a is connected to the inner circumferential surface of the rotating drum 1 by a resilient spring 6 interposed between a circular seat 5 fixed inside the arc-shaped arrangement part. Although it is shown that the chambers 4 are in pressure contact with each other, it is not necessarily necessary to create each chamber 4 separately, but the chambers 4 can be individually partitioned by partition walls within the arc-shaped suction chamber 4.
may be formed.

It is preferable that the suction chamber 3 is made of synthetic resin, for example, and its outer open surface is in close contact with the inner surface of the rotating drum 1 without interfering with the rotation of the drum 1 to prevent air leakage.

Each of the compartments 4 is communicated with a suction source (not shown) via piping 7 connected thereto.

Corresponding to the arc-shaped starting end of the suction chamber 3 arranged in an arc-shape, there is provided a storage 9 on the outside of the rotary drum 1 in which a large number of printing sheets a are stacked and stored, and the lowest sheet is The sheets are made to protrude one by one from the opening 11 at the lower part of the front wall of the storage 9 using the protruding pieces 10, and the protruded sheets are placed in a small roll group 12.
A feeding section for sheets was formed in such a way that the sheets were fed along one surface of the rotating drum by the rotation of the sheet.

In addition, a pressurized air chamber 8 is fixed to the arc-shaped terminal end of the suction chamber 3, and the inside thereof is connected to a pressurized air source and communicated with the subchamber 4, and air is blown out from the suction hole 2 located on the outer surface of the chamber 8. A discharge section for printed sheets was formed in which the leaf sheets a were blown off onto a discharge belt 15.

Incidentally, without providing the pressure chamber 8 as the discharge section, by communicating the suction hole 2 located in this section with the atmosphere, the suction force disappears and the sheet falls naturally or the sheet is peeled off and the discharge belt 15 is removed.
It is also possible to use a mechanism for transporting the material. 1 in the drawing
3 is a printing device 14 installed along the outer periphery of the rotary drum 1 between the supply section and the discharge section of the sheet a, and is a drying device such as an infrared lamp, and in the embodiment, a case of three-color printing is illustrated as the printing device. did.

In addition, printing methods include offset, flexo,
The format is arbitrary, such as gravure.

[Effect]

In the above apparatus, if the rotating drum 1 is rotated continuously or intermittently, and the printing sheets a are fed one by one from the feeding device to the rotating drum in synchronization with this, the sheets a communicate with the suction chamber 4. The sheet a is attracted to the suction hole 2 of the drum and transferred as the drum rotates, and during this time the suction hole 2 moves sequentially while communicating with the compartment 4 to securely hold the sheet a. While printing is performed on the paper, the paper is then subjected to a drying process in a drying device 14.

Thus, in the illustrated example, when the suction hole 2 that sucked the sheet a moves from the compartment 4 at the final end of the arcuate suction chamber 3 to face the next provided pressurized air chamber 8, the air blown from the chamber 8 Sheet a, which has been printed by
It is blown off from the surface and carried out to a predetermined position by the discharge belt 15, and as mentioned above, the suction hole 2 where printing has been completed without providing the pressure chamber 8 is further removed from the suction chamber 4 at the final end. When the suction hole 2 loses suction force due to communication with the atmosphere during movement, the sheet a may be automatically or functionally peeled off from the surface of the drum 1 and discharged.

The sheets a fed from the supply device to the drum surface one by one are attracted to the suction holes 2 on the circumferential surface of the drum and moved to the print processing section as the drum rotates, and after the processing is completed, the suction force It is taken out from one side of the drum by the disappearance of .

[Effect of idea]

In the present invention, the sheets are attracted by suction holes provided on the circumferential surface of the rotating drum and transferred one by one as the drum rotates, so the entire surface of the sheet is exposed and there is no need to worry about claws or the like as in the conventional method. Because the sheet is supported by The present invention has the effect of providing a device which is effective as a printing machine for cards and other sheet-fed sheets, in which work can be continued without affecting the overall suction function even if problems occur due to air leakage etc. in some parts.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a cutaway front view and FIG. 2 being a cutaway side view. 1...Hollow rotating drum, 2...Suction hole, 3...
Suction chamber, 4... Separate chamber, 9... Sheet supply section, 13... Printing device, 14... Drying device,
15... Discharge section for printed sheets, a...
...Single leaf sheet.

Claims (1)

[Scope of utility model registration request] A hollow rotary drum in which suction holes are arranged at regular intervals on the circumference, and in contact with the inner circumferential surface of the drum, a large number of compartments are continuous in the circumferential direction, and each outer side is opened to communicate with the suction holes. A nearly annular arc-shaped suction chamber is fixedly installed, and each branch chamber is connected to a suction source, and a printing sheet supply section and a printing sheet supply section are installed outside the hollow rotating drum corresponding to the arc-shaped starting end of the suction chamber. A sheet printing apparatus comprising: discharging sections for printed sheets corresponding to the arcuate end portions, and a printing mechanism provided at an intermediate portion between the supply section and the discharging section.