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KR-102964731-B1 - Converter and corresponding system

KR102964731B1KR 102964731 B1KR102964731 B1KR 102964731B1KR-102964731-B1

Abstract

The present invention relates to a converter (10) for manufacturing flat-pack or foldable boxes (1") from sheets (1), wherein the converter is configured to transport the sheets in a transport direction (T). The converter comprises a first printing module (16) configured to print on one of a first side and a second side of the sheet (1), and a die-cutting module (18) comprising a tool-holder cylinder and a counter-cylinder configured to be connected to a die-cutting tool, wherein the die-cutting module is configured to apply cutting lines to the first side of the sheet. The converter further comprises a separate scoring module (19) having a scoring tool configured to apply creasing lines to the second side of the sheet.

Inventors

  • 로뱅 올리비에

Assignees

  • 봅스트 리옹

Dates

Publication Date
20260513
Application Date
20220823
Priority Date
20210823

Claims (18)

  1. A converter (10) for manufacturing flat-packed or folding boxes (1") from sheets (1), wherein the converter is configured to transport the sheets in a transport direction (T), and the converter, A first printing module (16) configured to print on one of the first side and the second side of the sheet (1), A die-cutting module (18) comprising a counter-cylinder (48), a tool-holder cylinder (46), a first die-cutting tool (52a) provided with cutting edges (54), and a second die-cutting tool (52b) provided with cutting edges (54) and creasing edges (56) Includes, The converter (10) further comprises a scoring module (19) comprising a counter cylinder (62) and a tool-holder cylinder (60) configured to be connected to a scoring tool (64) provided with creasing edges (56), and the scoring module (19) configured to apply crease lines (2) on a second side of the sheet (1), and The scoring module (19) can be disabled, The tool-holder cylinder (46) is configured to optionally connect to the first die-cutting tool (52a) or the second die-cutting tool (52b), and When the first die-cutting tool (52a) is connected to the tool-holder cylinder (46), the die-cutting module (18) is configured to apply cutting lines to the first side of the sheet (1), and When the second die-cutting tool (52b) is connected to the tool-holder cylinder (46), the die-cutting module (18) is configured to apply cutting lines and crease lines (2) on the first side of the sheet (1), A converter in which wrinkle lines (2) can be applied on any side of the sheet.
  2. In Article 1, The die-cutting module (18) is a converter located downstream of the scoring module (19) in the transport direction (T).
  3. In Article 1, The scoring module (19) comprises a structural frame (70) having a first side frame portion (70a) and a second side frame portion (70b), and the side frame portions are configured to accommodate shafts (69, 71) of the tool-holder cylinder (60) and the counter cylinder (62), a converter.
  4. In Article 1, A converter in which the tool-holder cylinder of the above die-cutting module is positioned vertically above the transport path (P) of the sheet.
  5. In Article 4, The tool-holder cylinder of the scoring module above is a converter located vertically below the transport path (P) of the sheet.
  6. In Article 1, The tool-holder cylinder of the scoring module comprises attachment brackets (61) for attaching the scoring tool (64), a converter.
  7. In Article 6, The scoring tool is a transducer in the form of a sleeve die configured to be attached around the circumferential surface of the tool-holder cylinder.
  8. In any one of paragraphs 1 to 7, The above scoring tool is a converter that includes only creasing edges (56).
  9. In any one of paragraphs 1 to 7, A converter having a counter-cylinder of the scoring module configured to contact the creasing edges of the scoring tool.
  10. In any one of paragraphs 1 to 7, The first printing module (16) is a converter configured to print on the lower side (1b) of the sheet, which is a flexographic printing module.
  11. In any one of paragraphs 1 to 7, The first printing module (16) is a converter configured to print on the upper side (1a) of the sheet, which is a flexographic printing module.
  12. In any one of paragraphs 1 to 7, The first printing module (16) above is a converter that is an inkjet printing module.
  13. In Article 10, The converter further comprises a second printing module (17) configured to print on a second side of the sheet that is different from the side of the sheet printed by the first printing module (16).
  14. In Article 13, The above converter is a converter configured as an inkjet printing module.
  15. In any one of paragraphs 1 to 7, The conveying system (30) further includes a plurality of vacuum conveying units (32) and a cutting and scoring register control system (80), wherein the cutting and scoring register control system (80) includes a first sensor (S1) and a second sensor (S2), a control unit (82) and a memory (84). The first sensor (S1) is located upstream of the scorer module at the first sensor location (P1), and the second sensor (S2) is located upstream of the die-cutting module at the second sensor location (P2). The cutting and scoring register control system is configured to determine an actual scorer position (Pa_scorer) of the front leading edge (3) of the sheet at the first sensor position from the detection time (t1) provided by the first sensor, and to define the actual scorer position as an initial reference position (P_ref scorer) for the sheet, and the system is further configured to determine a corresponding die-cutter reference position (P_ref_die-cutter) for the front leading edge at the second sensor position (P2) based on the initial reference position. The control unit is configured to retrieve the detection time (t2) of the front leading edge (3) from the second sensor and to determine the actual die-cutter position (Pa_die-cutter) of the front leading edge of the sheet at the second sensor position (P2), The control unit is configured to determine a displacement distance (Δd) from the difference between the actual die-cutter position (Pa_die-cutter) and the die-cutter reference position (P_ref_die-cutter), and the control unit is further configured to modify the speed of at least one vacuum transfer unit (32b) to provide a longitudinal position correction (Δc) to the sheet between the scoring module and the die-cutting module, a converter.
  16. As a system, A converter comprising a first printing module (16) configured to print on one of the first side and the second side of a sheet (1), A die-cutting module (18) including a counter-cylinder (48) and a tool-holder cylinder (46), A scoring module (19) including a counter cylinder (62) and a tool-holder cylinder (60), A first die-cutting tool (52a) configured to be connected to a tool-holder cylinder (46) of the die-cutting module, the first die-cutting tool having only cutting edges, A second die-cutting tool (52b) configured to be connected to a tool-holder cylinder (46) of the die-cutting module, the second die-cutting tool having cutting edges and creasing edges, A first scoring tool (64) configured to be connected to the tool-holder cylinder (60) of the scoring module and having creasing edges Includes, A system comprising a first printing module (16) configured to print on a first side of the sheet, and a second printing module (17) configured to print on a second side of the sheet.
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Description

Converter and corresponding system The present invention relates to a converter for manufacturing flat-packed or folding boxes. In particular, the present invention relates to a scoring and die-cutting module of the converter. A converter including a rotary die cutter can be configured to manufacture flat-pack or folding boxes. This converter is fed sheets that are printed, cut, and scored to form blanks, which can later be folded and assembled into three-dimensional boxes. The blanks are designed to be folded manually or automatically on a folder-gluer machine. The box often needs to be provided with a motif or pattern printed on its outer surface, inner surface, or both inner and outer surfaces. Therefore, the machine operator is required to adjust the converter's configuration between different operations. Often, the sheet must be rotated to print on both the inner and outer surfaces of the box. When the box type changes, it is often required to modify the configuration of various modules in the converter, which in turn changes the printing plates and die-cutting tools that define the cutout shapes and crease lines. Sometimes, it is also necessary to change the anilox cylinder to achieve higher resolution or ink supply, or to better adapt to the surface quality of the paper or cardboard. The outer surface of a box is often the most important. However, for other purposes, such as boxes for mail orders and online shopping, it may be advantageous to provide boxes with a discrete outer surface and, instead, a more sophisticated printed inner surface. Therefore, it is necessary to provide a flexible method for printing on the inner and outer surfaces of a box with a converter while reducing the need to change tooling as the characteristics of the box change. The present invention will now be described by way of example and with reference to embodiments illustrated in the accompanying drawings, in which the same reference numbers will be used for similar elements: FIGS. 1A and FIGS. 1B illustrate a flat-pack box and a folded box obtainable from the flat-pack box. FIG. 1c illustrates a sheet material to be used in the manufacture of a flat-pack box. Figure 2 is a schematic perspective view of a converter in the form of a rotary die-cutter. Figure 3 is a schematic perspective view of a part of the converter's transport system. FIGS. 4a to 4d are schematic cross-sectional views of converters according to embodiments of the present invention. Figure 5 is a schematic perspective view of a flexographic printing assembly. FIG. 6a is a schematic perspective view of a die-cutting module. FIG. 6b is a schematic perspective view and partial cutaway view of the die-cutting module of FIG. 6a when equipped with the first tool. FIG. 6c is a schematic perspective view and partial cutaway view of the die-cutting module of FIG. 6a when equipped with a second tool. FIG. 7a is a schematic perspective view of a creasing module according to one embodiment of the present invention. FIG. 7b is a schematic perspective view and partial cutaway view of the creasing module of FIG. 7a. FIGS. 8a to 8d are schematic cross-sectional views of converters according to embodiments of the present invention. FIG. 9 is a schematic diagram illustrating exemplary register displacement of a sheet in cutting and creasing modules. FIG. 10 is a schematic diagram of a register control system in one embodiment of the present invention. Now, referring to FIGS. 1a and 1b, which illustrate an example of a flat-pack box (1") and a box (1') obtained from the flat-pack box (1") after folding. As can be seen in the drawings, the flat-pack box (1") includes crease lines (2) that enable folding, cut outer edges (4) that provide the overall shape to the box (1'), and may further include cutouts (5) (e.g., for handles). The flat-pack box (1") is obtained from a sheet substrate (1) such as that illustrated in FIG. 1c. The sheet substrate (1) is a square or rectangular sheet and is composed of cardboard or paperboard. The flat-pack box (1") of FIG. 1a is provided with a printed motif (6) on one side and can be manufactured in a converter (10) as illustrated in FIG. 2. The converter (10) illustrated in FIG. 2 is a configuration of a rotary die-cutter machine (10). At the entry position of the converter (10), a sheet substrate (1) is placed in a feeder module (14) and is transported through the converter (10) in a transport direction (T) to undergo a series of operations of printing, cutting, and creasing the sheet substrate (1). The transport direction (T) is defined from the entry to the exit of the converter (10). The sheet (1) is transported along a transport path (P) which can be defined as the trajectory of the sheet (1) through the converter (10). From the inlet of the converter (10) and downstream along the transport direction (T), the converter (10) may include a prefeeder (12), a feeder module (14), a printing section (13) including a plurality of printing modu