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CN-122008707-A - Method for operating a printing press

CN122008707ACN 122008707 ACN122008707 ACN 122008707ACN-122008707-A

Abstract

The method of operation of the printer includes a portrait format mode and a landscape format mode. In both modes, the sheets are printed on the front and back sides and are turned between them in a turning device (7). Furthermore, in both modes, the orientation of one sheet edge of the respective sheet with respect to the other sheet edge is determined by means of at least one detection device (8), and based thereon the sheet alignment for reverse printing is performed, which is performed in the alignment device (5). The front and back printing is preferably carried out in a printing station (3) by means of ink jet.

Inventors

  • R. Hu Pei

Assignees

  • 海德堡印刷机械股份公司

Dates

Publication Date
20260512
Application Date
20251112
Priority Date
20241112

Claims (10)

  1. 1. A method for operating a printing press in different modes, characterized in that, In the first mode of operation, the first mode, Conveying the first sheet (34) in a longitudinal format along a conveying plane (13) in a conveying direction (14), -Front printing on the front side (39) of the first sheet (34), The first sheet (34) is turned over in a turning device (7), -Reverse printing on the reverse side (51) of the first sheet (34), Wherein between the turning and the reverse printing, the first sheet (34) is aligned by means of a first roller pair (17) and a second roller pair (18), Wherein, between the front printing and the alignment, an orientation determination of a first sheet edge of the first sheet (34) relative to a second sheet edge is performed by means of a reflective scanner pair (33) of the detection device (8), and Wherein the first sheet edge and the second sheet edge of the first sheet (34) each extend transversely with respect to the transport direction (14), In the second mode of operation, the first mode, Conveying the second sheet (35) in a transverse format along a conveying plane (13) in a conveying direction (14), -Front printing on the front side (37) of the second sheet (35), In a turning device (7) a second sheet (35) is turned over, -Reverse printing on the reverse side (52) of the second sheet (35), Wherein between the turning and the reverse printing, a second sheet (35) is aligned by means of a first roller pair (17) and a second roller pair (18), Wherein, between the front side printing and the alignment, an orientation determination of a first sheet edge (43) of the second sheet (35) relative to a second sheet edge (44) is performed by means of a reflective scanner pair (33) of the detection device (8), and Wherein the first sheet edge (43) and the second sheet edge (44) of the second sheet (35) each extend transversely to the transport direction (14).
  2. 2. The method of claim 1, wherein the step of determining the position of the substrate comprises, When the first sheet (34) is aligned according to the result of the orientation determination of the first sheet edge relative to the second sheet edge, a first motor (11) and a second motor (12) are controlled by a control device (10), the first motor (11) driving the first roller pair (17) and the second motor (12) driving the second roller pair (18).
  3. 3. The method of claim 1, wherein the step of determining the position of the substrate comprises, Between the front printing on the front side (39) of the first sheet (34) and the alignment of the first sheet (34), a further orientation determination of the first sheet edge of the first sheet (34) relative to the second sheet edge is carried out by means of a further reflection scanner of a further detection device (8).
  4. 4. The method of claim 3, wherein the step of, An average of the position determination of the first sheet edge from the first sheet (34) relative to the second sheet edge by means of the pair of reflective optical scanners (33) and the position determination of the first sheet edge from the first sheet (34) relative to the second sheet edge by means of the further pair of reflective optical scanners is formed by means of the computer (9).
  5. 5. The method of claim 4, wherein the step of determining the position of the first electrode is performed, When aligning a first sheet (34) according to the average value, a first motor (11) and a second motor (12) are controlled by a control device (10), the first motor (11) driving the first roller pair (17) and the second motor (12) driving the second roller pair (18).
  6. 6. The method of claim 1, wherein the step of determining the position of the substrate comprises, When the second sheet (35) is aligned according to the determination result of the orientation of the first sheet edge (43) of the second sheet (35) relative to the second sheet edge (44), a first motor (11) and a second motor (12) are controlled by a control device (10), the first motor (11) driving the first roller pair (17) and the second motor (12) driving the second roller pair (18).
  7. 7. The method of claim 1, wherein the step of determining the position of the substrate comprises, Between the front printing on the front side (37) of the second sheet (35) and the alignment of the second sheet (35), a further orientation determination of the first sheet edge (43) of the second sheet (35) relative to the second sheet edge (44) is carried out by means of a further reflection scanner of a further detection device (8).
  8. 8. The method of claim 7, wherein the step of determining the position of the probe is performed, An average of the position determination of the first sheet edge (43) from the second sheet (35) relative to the second sheet edge (44) by means of the pair of reflective optical scanners (33) and the position determination of the first sheet edge (43) from the second sheet (35) relative to the second sheet edge (44) by means of the further pair of reflective optical scanners is formed by means of the computer (9).
  9. 9. The method of claim 8, wherein the step of determining the position of the first electrode is performed, When the second sheet (35) is aligned according to the average value, a first motor (11) and a second motor (12) are controlled by a control device (10), the first motor (11) driving the first roller pair (17) and the second motor (12) driving the second roller pair (18).
  10. 10. The method according to any one of claims 1 to 9, wherein, The front side printing on the front side (39) of the first sheet (34) and the back side printing on the back side (51) of the first sheet (34) are respectively carried out by means of ink-jet printing, and The front side printing on the front side (37) of the second sheet (35) and the back side printing on the back side (52) of the second sheet (35) are performed by means of inkjet printing, respectively.

Description

Method for operating a printing press Technical Field The present invention relates to a method of operating a printing press in different modes. Background Such methods are used to variably print on a sheet between print jobs. For example, US8,308,158B2 describes a method for operating a printing press, in which printing is performed on one side of a first sheet in a first mode "single-sided printing" and on both sides of a second sheet in a second mode "double-sided printing". The document also indicates that the invention described therein applies both in the case of sheets conveyed with their long sides as leading edges and in the case of sheets conveyed with their short sides as leading edges. EP2,064,140B1 describes a sheet alignment device in a printing press, constituting a further prior art. Disclosure of Invention The object of the invention is to provide a further method for operating a printing press. The object is achieved by a method for operating a printing press in different modes, characterized in that in a first mode a first sheet is transported in a transport direction in a longitudinal format along a transport plane, front printing is carried out on the front side of the first sheet, front printing is carried out in a reversing device, back printing is carried out on the back side of the first sheet, wherein between the reversing and the back printing an alignment of the first sheet is carried out by means of a first roller pair and a second roller pair, wherein between the front printing and the alignment the position of the first sheet edge relative to the second sheet edge is determined by means of a reflective light scanner pair of a detection device, and the first sheet edge and the second sheet edge extend in a transverse format along the transport plane in the transport direction, respectively, in a second mode the front printing is carried out on the front side of the second sheet, the back printing is carried out on the back side of the second sheet in a reversing device, wherein between the reversing and the back printing is carried out by means of a first roller pair and a second roller pair, wherein between the reversing and the back printing is carried out by means of a reflective light scanner pair and the position of the second sheet edge is determined relative to the first sheet edge and the second sheet edge extends in a transverse direction relative to the transport plane. An advantage of the method of the invention is that even those sheets which deviate relatively greatly from the ideal rectangular shape within their manufacturing tolerances can be aligned in such a way that damage to subsequent processing after printing of the sheets, for example angular errors between the printed image and the cut image, is avoided. The following expansions may be implemented alone or in any combination: When the first sheet is aligned according to the orientation determination result of the first sheet edge with respect to the second sheet edge, the first motor and the second motor may be controlled by the control device, and the first motor may drive the first roller pair, and the second motor may drive the second roller pair. Between the front printing on the front side of the first sheet and the alignment of the first sheet, a further orientation determination of the first sheet edge of the first sheet relative to the second sheet edge can be performed by means of a further reflective optical scanner of a further detection device. The average of the position determination of the first sheet edge from the first sheet with respect to the second sheet edge by means of the pair of reflective optical scanners and the position determination of the first sheet edge from the first sheet with respect to the second sheet edge by means of the other pair of reflective optical scanners can be formed by a computer. When the first sheet is aligned according to the average value, the first motor and the second motor may be controlled by the control device, and the first motor may drive the first roller pair, and the second motor may drive the second roller pair. When the second sheet is aligned according to the determination result of the orientation of the first sheet edge with respect to the second sheet edge, the first motor and the second motor may be controlled by the control device, and the first motor may drive the first roller pair, and the second motor may drive the second roller pair. Between the front printing on the front side of the second sheet and the alignment of the second sheet, a further orientation determination of the first sheet edge of the second sheet relative to the second sheet edge can be performed by means of a further reflection scanner pair of a further detection device. An average of the position determination of the first sheet edge from the second sheet with respect to the second sheet edge by means of the reflective optical scanner and the position determinatio