JPS6344661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a delivery device in a sheet-fed rotary printing press having a driven solid suction roller with a plurality of suction holes.

Conventional technology In the paper ejection device of a sheet-fed rotary printing press,
The sheets are deposited on the stacking board at a speed that is actually reduced to zero. In practice, it is clear that the sheets must be braked in short strokes and then deposited on the stacking board.

A driven suction roller, known for example from US Pat. No. 2,969,980, for braking the sheets is integrated into the side wall of the vacuum chamber. Known suction rollers of this kind have the advantage that all the suction holes provided on the suction roller are connected to an air suction source, so that, for example, when discharging narrow sheets, the sheet Dust will be sucked in through the uncovered intake holes. Furthermore, the known suction rollers are of rather large construction and cannot be mounted sufficiently close to the paper stack.

Problem to be Solved by the Invention It is an object of the invention to minimize the distance between the center of the suction roller and the leading edge of the paper stack, to smooth out wrinkles in the sheets during the braking process, and to reduce energy consumption. The aim is to save as much as possible.

Means for Solving the Problem The means taken to solve the above-mentioned problem is that the suction roller is provided with a plurality of through holes, and the suction roller is further provided with a plurality of through holes partitioned from each other in parallel in the longitudinal direction of the suction roller. A plurality of air supply sections are arranged, each of which has a cylindrical recess, the curvature of which corresponds to the curvature of the outer peripheral surface of the suction roller, It is connected to the suction source so as to be connectable and disconnectable, and further, the opening of the through hole is arranged on the circumferential surface of the suction roller forming one spiral in a region from the center of the suction roller to one end, and The region from the center of the suction roller to the other end is arranged on the circumferential surface of the suction roller forming one helical line having a phase opposite to the above-mentioned helical line, so that the suction air can flow through the openings while the roller is rotating. The actuator is configured to act by shifting sequentially from the center of the sheet toward both side edges thereof.

Effects of the Invention According to the present invention, the suction air supply section provided on the suction roller is divided into a plurality of sections, so that, for example, when a narrow sheet of paper is discharged, it is not covered by the sheet of paper. It is possible to cut off the air supply to the air supply section to which the empty air intake holes belong, thus saving energy and preventing dust from being sucked in through the air intake holes that are not covered by sheets. can also be prevented. Furthermore, by forming the through holes as in the present invention, the sheet of paper is rubbed from the center of the suction roller to both sides, and wrinkles in the sheet of paper can be smoothed out.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a side frame (not shown) of a sheet delivery device, a suction roller 1 is driven in a known manner.
is supported. The suction roller is also mounted movably in the sheet transport direction or in a direction opposite to the sheet transport direction, as is known in the art. This means that, for example, in the case of long sheets of paper, the suction roller 1 must be moved opposite to the sheet transport direction, which results in a gap between the front of the paper stack and the suction roller 1. Sufficient space is available for the required sheets. The suction roller 1 is constructed as a solid member, and is provided with a plurality of through holes 2 that cross the rotation axis of the suction roller.
The through hole has a diameter of 4 mm, for example. The through holes 2 are located in each case on a spiral line starting from the center of the suction roller and rising around the suction roller to the left or to the right. The through holes 2 are arranged laterally offset from each other by approximately 10 degrees and approximately 6 mm on the circumferential surface. On the underside of the suction roller 1, over the entire length of the suction roller 1 with through holes 2, a plurality of suction air supply sections 3 separated from each other are provided.
are arranged in parallel. Individual intake air supply section 3
has a cylindrical recess, the curvature of which corresponds to the curvature of the outer circumferential surface of the suction roller 1 with a radius r, thus preventing outside air from entering between the suction roller 1 and the suction air supply section 3. sealed against ambient air to prevent Each intake air supply section 3 is provided with a central longitudinal groove 4, which is connected to a connecting pipe 6.
connected to. Each of the connecting pipes 6 is connected via a hose 7 to a shut-off valve 8 assigned to the connecting pipe. All shutoff valves 8 are connected via hoses or pipes to an air intake source (not shown).

The intake air of the individual intake air supply sections 3 can be connected or disconnected via the isolation valves 8 . A table 9 is provided substantially adjacent to the suction roller 1. The surface 11 of the table 9 is arranged slightly below the uppermost point of the suction roller 1. table 9 is its surface 1
1 is provided with an outlet opening 12 for air blasting. In this case, the outlet opening 12 is designed in such a way that it generates an air flow along the surface 11, so that, corresponding to the hydrodynamic paradox, the sheet is moved onto the table 9. I am drawn to the direction.

By arranging the through holes 2 in a spiral manner, the through holes are successively connected to or disconnected from the suction source as the suction roller 1 rotates. Therefore, only several through-holes connected to the suction air source are simultaneously loaded with suction air, exerting a braking effect only on a small area of the sheet covering these through-holes, whereas the suction air The remaining sheet areas covering the through holes which are isolated from the source are not braked. This creates a tensile force in the plane of the sheet, which causes the sheet to unwrinkle and is rubbed from the center of the suction roller to the lateral edges of the sheet. It is made to eliminate wrinkles.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a suction roller according to the invention, FIG. 2 is a plan view of a suction air supply section, and FIG. 3 is a partially cutaway plan view of the suction roller. 1...Suction roller, 2...Through hole, 3...Suction supply section, 4...Vertical groove, 6...Connection pipe, 7...
Hose, 8...Shutoff valve, 9...Table, 11...
...Surface, 12...Exit opening.

Claims (1)

[Claims] 1. A delivery device in a sheet-fed rotary printing press having a driven solid suction roller with a plurality of suction holes, said suction roller being provided with a plurality of through holes 2, and further comprising a A plurality of intake air supply sections 3 are arranged in parallel and partitioned from each other in the longitudinal direction of the suction roller, each of which has a cylindrical recess, and the curvature of this recess has a radius r. 1, and furthermore, the intake air supply section 3 is connected to the intake air source so as to be connectable and disconnectable, and furthermore, the through hole 2
The openings are arranged on the circumferential surface of the suction roller 1 to form one helical line in the area from the center of the suction roller to one end, and are arranged on the circumferential surface of the suction roller 1 in the area from the center of the suction roller to the other end. are arranged in one spiral of opposite phase on the circumference of the suction roller 1, so that during rotation of the roller suction air flows from the center of the sheet through the openings to its lateral edges. A paper discharge device characterized in that the paper discharge device operates by sequentially shifting toward each direction.