TW202411080A - A method for aligning a print pattern on a print medium and a printing device - Google Patents
A method for aligning a print pattern on a print medium and a printing device Download PDFInfo
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- TW202411080A TW202411080A TW112124756A TW112124756A TW202411080A TW 202411080 A TW202411080 A TW 202411080A TW 112124756 A TW112124756 A TW 112124756A TW 112124756 A TW112124756 A TW 112124756A TW 202411080 A TW202411080 A TW 202411080A
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- lateral edge
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- registration mark
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- 238000007639 printing Methods 0.000 title claims abstract description 169
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 1
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 1
- 102100023591 Polyphosphoinositide phosphatase Human genes 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000007644 letterpress printing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/02—Conveying or guiding webs through presses or machines
- B41F13/025—Registering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/10—Forme cylinders
- B41F13/12—Registering devices
- B41F13/14—Registering devices with means for displacing the cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0081—Devices for scanning register marks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/02—Arrangements of indicating devices, e.g. counters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/50—Marks on printed material
- B41P2233/52—Marks on printed material for registering
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Handling Of Sheets (AREA)
Abstract
Description
本發明係關於一種在列印裝置中之列印介質上對齊若干列印圖案的方法，且係關於一種具有至少兩個列印單元之列印裝置。特定言之，本發明係關於輪轉凹印機、柔性版印刷機或凸版印刷機。The present invention relates to a method for aligning a plurality of printed patterns on a printing medium in a printing device, and to a printing device having at least two printing units. Specifically, the present invention relates to a rotary gravure printing machine, a flexographic printing machine or a letterpress printing machine.
列印裝置通常具有用於列印不同色彩平面之若干列印單元。列印介質隨後通過不同列印單元。The printing device usually has several printing units for printing different color planes. The print medium then passes through the different printing units.
色彩平面之對齊必須極準確。特定言之，超過50微米之色彩未對齊將顯著影響列印品質。因此，需要控制列印單元相對於水平及豎直對齊以及相對於偏斜之套準。The alignment of the color planes must be extremely accurate. Specifically, color misalignment of more than 50 microns will significantly affect the print quality. Therefore, it is necessary to control the registration of the print units with respect to horizontal and vertical alignment as well as with respect to skew.
已知在列印介質之側向邊緣區中列印套準記號有助於對齊控制。然而，具有套準記號之區域並不促成最終列印且必須在列印過程結束時切除。It is known to print registration marks in the lateral edge areas of the print media to assist in alignment control. However, the area with the registration marks does not contribute to the final print and must be cut off at the end of the printing process.
因此，本發明之目標為使得能夠在列印裝置中之列印介質上充分對齊列印圖案，同時減少所產生之廢料。Therefore, an object of the present invention is to enable adequate alignment of printed patterns on a print medium in a printing device while reducing the waste generated.
此目標藉由一種在列印裝置中之列印介質上對齊列印圖案的方法達成，該列印裝置至少具有第一列印單元及第二列印單元，其中各列印單元包含列印輥筒且其中第二列印單元包含光學偵測單元，其中列印介質包含第一側向邊緣區及與第一側向邊緣區相對之第二側向邊緣區且沿著縱向方向自第一列印單元行進至第二列印單元。一個方法步驟包含藉由第一列印單元在第一側向邊緣區上列印第一套準記號且在第二側向邊緣區上列印第二套準記號。另一方法步驟包含使用偵測單元判定第一套準記號在第一側向邊緣區處的水平及豎直位置，且基於第一套準記號之位置調整豎直及/或水平套準。另一方法步驟包含在基於第一套準記號之位置調整豎直及/或水平套準之後，藉由第二列印單元在列印介質之第一側向邊緣區上列印第三套準記號，且在第二側向邊緣區上列印第四套準記號。第二側向邊緣區上之第二及第四套準記號的最大寬度小於第一側向邊緣區上之第一及第三套準記號的最大寬度。This object is achieved by a method for aligning a print pattern on a print medium in a printing device, the printing device having at least a first printing unit and a second printing unit, wherein each printing unit comprises a print roller and wherein the second printing unit comprises an optical detection unit, wherein the print medium comprises a first lateral edge region and a second lateral edge region opposite to the first lateral edge region and travels from the first printing unit to the second printing unit along a longitudinal direction. A method step comprises printing a first registration mark on the first lateral edge region and printing a second registration mark on the second lateral edge region by the first printing unit. Another method step includes determining the horizontal and vertical position of the first registration mark at the first lateral edge region using a detection unit, and adjusting the vertical and/or horizontal registration based on the position of the first registration mark. Another method step includes printing a third registration mark on the first lateral edge region of the print medium and printing a fourth registration mark on the second lateral edge region by a second printing unit after adjusting the vertical and/or horizontal registration based on the position of the first registration mark. The maximum width of the second and fourth registration marks on the second lateral edge region is less than the maximum width of the first and third registration marks on the first lateral edge region.
歸因於第二側向邊緣區上之套準記號的寬度小於第一側向邊緣區上之套準記號的寬度，有可能獲得列印介質上之空間且因此減少廢料。特定言之，第二側向邊緣區上之套準記號的寬度可減小，此係因為水平套準係基於藉由第一列印單元列印在第一側向邊緣區上的第一套準記號之位置調整，使得藉由第二列印單元列印的套準記號之水平位置已明確界定。因此，確保藉由第二列印單元列印在第二側向邊緣區上之套準記號越過光學偵測單元之敏感區域而不管其大小減小。然而，本發明方法仍實現高度準確對齊。Due to the fact that the width of the registration mark on the second lateral edge region is smaller than the width of the registration mark on the first lateral edge region, it is possible to gain space on the print medium and thus reduce waste. In particular, the width of the registration mark on the second lateral edge region can be reduced because the horizontal registration is based on the position adjustment of the first registration mark printed on the first lateral edge region by the first printing unit, so that the horizontal position of the registration mark printed by the second printing unit is clearly defined. Therefore, it is ensured that the registration mark printed on the second lateral edge region by the second printing unit passes over the sensitive area of the optical detection unit regardless of its size reduction. However, the method of the present invention still achieves highly accurate alignment.
第二側向邊緣區上之套準記號的寬度例如介於第一側向邊緣區上之套準記號的寬度的三分之一至三分之二之間。The width of the registration mark on the second lateral edge region is, for example, between one third and two thirds of the width of the registration mark on the first lateral edge region.
豎直套準可藉由使第二列印單元之列印輥筒的旋轉速度暫時變化來調整。Vertical registration can be adjusted by temporarily varying the rotational speed of the print roller of the second print unit.
水平套準可藉由使第二列印單元之列印輥筒沿著其旋轉軸移位（詳言之，藉由專用移位裝置）來調整。The horizontal registration can be adjusted by shifting the print roller of the second printing unit along its rotation axis (in detail, by a dedicated shifting device).
根據一個態樣，第一側向邊緣區上之套準記號係二維套準記號，且第二側向邊緣區上之套準記號係一維或二維套準記號。二維套準記號係允許使用單點感測器（例如，光學光電池）量測兩個位置（詳言之，記號之水平及豎直位置）的記號。一維套準記號係允許僅量測一個位置（詳言之，豎直位置）之記號。According to one aspect, the registration mark on the first lateral edge region is a two-dimensional registration mark, and the registration mark on the second lateral edge region is a one-dimensional or two-dimensional registration mark. A two-dimensional registration mark is a mark that allows two positions (in detail, the horizontal and vertical positions of the mark) to be measured using a single point sensor (e.g., an optical photocell). A one-dimensional registration mark is a mark that allows only one position (in detail, the vertical position) to be measured.
舉例而言，第一側向邊緣區上之套準記號具有水平邊緣及傾向水平邊緣之邊緣。水平邊緣允許偵測套準記號之豎直位置，而傾斜邊緣允許量測水平位置。歸因於傾斜邊緣，套準記號之經偵測長度取決於套準記號之水平位置而不同。For example, a register mark on the first lateral edge region has a horizontal edge and an edge inclined to the horizontal edge. The horizontal edge allows the vertical position of the register mark to be detected, while the inclined edge allows the horizontal position to be measured. Due to the inclined edge, the detected length of the register mark is different depending on the horizontal position of the register mark.
舉例而言，觸發碼藉由第一列印單元列印在第一側向邊緣區上，其中藉由第一列印單元列印在第一側向邊緣區上之第一套準記號相對於列印介質之行進方向列印在觸發碼之後。觸發碼允許在不事先知曉記號之縱向位置的情況下量測記號。詳言之，使用觸發碼設定套準系統之零位置。For example, a trigger code is printed by the first printing unit on the first lateral edge region, wherein a first registration mark printed by the first printing unit on the first lateral edge region is printed after the trigger code relative to the travel direction of the print medium. The trigger code allows the mark to be measured without knowing the longitudinal position of the mark in advance. In detail, the trigger code is used to set the zero position of the registration system.
較佳地，觸發碼藉由第一列印單元列印在第二側向邊緣區上，藉由第一列印單元列印在第二側向邊緣區上之第二套準記號相對於列印介質之行進方向列印在觸發碼之後。除關於第一側向邊緣區上之觸發碼已提及的優點之外，第二側向邊緣區上之觸發碼亦允許相比於第一側向邊緣區上的套準記號將套準記號置放於第二側向邊緣區上的任意豎直位置處。因此，套準記號之列印圖案更靈活。Preferably, the trigger code is printed on the second lateral edge region by the first printing unit, and the second registration mark printed on the second lateral edge region by the first printing unit is printed after the trigger code relative to the travel direction of the print medium. In addition to the advantages already mentioned about the trigger code on the first lateral edge region, the trigger code on the second lateral edge region also allows the registration mark to be placed at any vertical position on the second lateral edge region compared to the registration mark on the first lateral edge region. Therefore, the printing pattern of the registration mark is more flexible.
可量測藉由第二列印單元列印在第一側向邊緣區上之第三套準記號與參考點的豎直距離，且量測藉由第二列印單元列印在第二側向邊緣區上之第四套準記號與參考點的豎直距離，且基於經量測距離偵測第一與第二列印單元之間的偏斜。此允許以簡單方式偵測偏斜未對齊。The vertical distance between the third registration mark printed by the second printing unit on the first lateral edge area and the reference point can be measured, and the vertical distance between the fourth registration mark printed by the second printing unit on the second lateral edge area and the reference point can be measured, and the skew between the first and second printing units can be detected based on the measured distances. This allows skew misalignment to be detected in a simple manner.
參考點可為觸發碼、由第一列印單元列印之套準記號或分別與第三套準記號及第四套準記號具有經界定距離之另一記號。The reference point may be a trigger code, a registration mark printed by the first printing unit, or another mark having a defined distance from the third registration mark and the fourth registration mark, respectively.
根據一個實施例，量測藉由第一及第二列印單元列印在第一側向邊緣區上之套準記號之間的豎直距離，且量測藉由第一及第二列印單元列印在第二側向邊緣區上之套準記號之間的豎直距離，且可比較套準記號之間的豎直距離以偵測第一與第二列印單元之間的偏斜。特定言之，可基於兩個經量測豎直距離之比較偵測偏斜。若兩個經偵測豎直距離相等，則無偏斜存在，但若兩個經量測豎直距離彼此不同，則列印單元必須針對偏斜加以調整。According to one embodiment, the vertical distance between the registration marks printed by the first and second printing units on the first lateral edge region is measured, and the vertical distance between the registration marks printed by the first and second printing units on the second lateral edge region is measured, and the vertical distances between the registration marks can be compared to detect the skew between the first and second printing units. In particular, the skew can be detected based on the comparison of the two measured vertical distances. If the two detected vertical distances are equal, no skew exists, but if the two measured vertical distances are different from each other, the printing units must be adjusted for the skew.
舉例而言，判定第一列印單元與第二列印單元之間的偏斜程度，且藉由樞轉位於第一列印單元之列印輥筒與第二列印單元之列印輥筒之間的偏斜輥筒調整偏斜。藉此，校正偏斜未對齊。For example, the degree of skew between the first printing unit and the second printing unit is determined, and the skew is adjusted by pivoting a skew roller between the print roller of the first printing unit and the print roller of the second printing unit. Thereby, the skew misalignment is corrected.
可量測藉由第一列印單元列印在第二側向邊緣區上之第二套準記號的水平位置，且可再次基於第二套準記號在第二側向邊緣區上的位置調整水平套準。由此，色彩平面之對齊可甚至更準確。詳言之，水平調整可藉由平均化第一及第二套準記號之量測而改良。The horizontal position of the second registration mark printed by the first printing unit on the second lateral edge region can be measured, and the horizontal registration can be adjusted again based on the position of the second registration mark on the second lateral edge region. Thereby, the alignment of the color plane can be even more accurate. In detail, the horizontal adjustment can be improved by averaging the measurement of the first and second registration marks.
本發明之目標進一步藉由列印裝置實現，該列印裝置經組態以執行本發明方法及偏斜調整，其中至少兩個列印單元依序佈置，其中各列印單元包含列印輥筒及偏斜輥筒，且佈置在第一列印單元之後的第二列印單元包含光學偵測單元，該光學偵測單元較佳地包含佈置在列印輥筒下游之第一及第二光電池，使得第一光電池可偵測列印介質之第一側向邊緣區中的套準記號，且第二光電池可偵測列印介質之第二側向邊緣區中的套準記號。The object of the present invention is further achieved by a printing device, which is configured to execute the method and skew adjustment of the present invention, wherein at least two printing units are arranged in sequence, wherein each printing unit includes a printing roller and a skew roller, and the second printing unit arranged after the first printing unit includes an optical detection unit, which preferably includes a first and a second photocell arranged downstream of the printing roller, so that the first photocell can detect the registration mark in the first lateral edge area of the printing medium, and the second photocell can detect the registration mark in the second lateral edge area of the printing medium.
第二光電池較佳地具有在其寬度上比第一光電池小的敏感區域。第二光電池可屬於同一類型且為第一光電池之模型，但以不同方式位向。The second photocell preferably has a sensitive area that is smaller in width than the first photocell. The second photocell may be of the same type and model as the first photocell, but oriented in a different way.
偏斜輥筒之旋轉軸例如可在一側移動且在相對側固定。藉此，可調整偏斜參數。The rotation axis of the deflection roller can be movable on one side and fixed on the opposite side, for example. In this way, the deflection parameter can be adjusted.
作為替代方案，偏斜輥筒可在兩側移動。As an alternative, the deflection roller can be moved on both sides.
圖1示意性地展示列印裝置10。FIG. 1 schematically shows a printing device 10 .
列印裝置包含退繞機12、預加熱單元14、第一列印單元16及佈置在第一列印單元16之後的第二列印單元18。然而，列印裝置10可包含兩個以上列印單元。The printing device includes an unwinder 12, a preheating unit 14, a first printing unit 16, and a second printing unit 18 disposed after the first printing unit 16. However, the printing device 10 may include more than two printing units.
舉例而言，列印裝置10係具有七個列印單元之七色（heptachrome）列印裝置。For example, the printing device 10 is a heptachrome printing device having seven printing units.
請注意，第一列印單元16未必為列印裝置之第一列印單元。在第一列印單元16之前可能存在不需要精確套準之列印單元。此外，第二列印單元18可為佈置在第一列印單元之後但不必與第一列印單元16相連的任何列印單元。Please note that the first printing unit 16 is not necessarily the first printing unit of the printing device. There may be a printing unit that does not require precise registration before the first printing unit 16. In addition, the second printing unit 18 can be any printing unit arranged after the first printing unit but not necessarily connected to the first printing unit 16.
在各列印單元16、18之後，佈置乾燥器20。After each printing unit 16, 18, a dryer 20 is arranged.
各列印單元16、18包含偏斜輥筒21、22及列印輥筒24、25。Each printing unit 16 , 18 includes a deflection roller 21 , 22 and a printing roller 24 , 25 .
第二列印單元18（其亦在圖2中可視化）另外包含佈置在列印輥筒25下游之光學偵測單元26。The second printing unit 18 , which is also visible in FIG. 2 , further comprises an optical detection unit 26 arranged downstream of the printing roller 25 .
偵測單元26可包含兩個光電池28、29。 The detection unit 26 may include two photocells 28, 29.
舉例而言，光電池28、29為單色光電池。For example, the photovoltaic cells 28 and 29 are monochromatic photovoltaic cells.
作為替代方案，光學偵測單元26可由兩個攝像頭28、29組成。As an alternative, the optical detection unit 26 may be composed of two cameras 28, 29.
列印介質30沿著藉由箭頭32指示之行進方向在列印裝置10中移動。The print medium 30 moves in the printing device 10 along the travel direction indicated by arrow 32.
為了確保高列印品質，列印單元16、18必須在水平及豎直方向上以及相對於偏斜以較高準確度對齊。In order to ensure high print quality, the print units 16, 18 must be aligned with a high degree of accuracy in the horizontal and vertical directions as well as with respect to skew.
豎直方向對應於列印介質30之行進方向。The vertical direction corresponds to the traveling direction of the printing medium 30 .
水平方向橫向於列印介質30之行進方向。The horizontal direction is transverse to the traveling direction of the printing medium 30 .
為調整列印單元16、18之水平未對齊，列印輥筒24、25沿著其旋轉軸移動。To adjust the horizontal misalignment of the printing units 16, 18, the printing rollers 24, 25 are moved along their rotation axes.
為調整列印單元16、18之豎直未對齊，藉由在列印之前，亦即在列印輥筒24、25與列印介質30接觸之前調整列印輥筒之相位來調整列印輥筒24、25之角度位置。此可藉由使列印輥筒24之旋轉速度暫時變化來進行。To adjust the vertical misalignment of the print units 16, 18, the angular position of the print rollers 24, 25 is adjusted by adjusting the phase of the print rollers 24, 25 before printing, that is, before the print rollers 24, 25 contact the print medium 30. This can be done by temporarily changing the rotation speed of the print roller 24.
藉助於例如藉由沿著由圖2中之箭頭23指示之方向移動偏斜輥筒21、22之一側同時保持另一側固定來樞轉偏斜輥筒21、22來校正偏斜。The skew is corrected by pivoting the skew rollers 21, 22, for example by moving one side of the skew rollers 21, 22 in the direction indicated by arrow 23 in FIG. 2 while keeping the other side fixed.
關於圖3至圖5描述用於偵測不同色彩平面之未對齊的方法。A method for detecting misalignment of different color planes is described with respect to FIGS. 3 to 5 .
色彩平面係藉由單一列印單元16、18列印之圖案。The color plane is a pattern printed by a single printing unit 16, 18.
首先，藉由第一列印單元16將觸發碼34列印在列印介質30之第一側向邊緣35區上。在圖式中，第一側向邊緣區35在列印介質30之左側。First, the trigger code 34 is printed on the first lateral edge 35 area of the print medium 30 by the first printing unit 16. In the figure, the first lateral edge area 35 is on the left side of the print medium 30.
此外，藉由第一列印單元16將觸發碼36列印在與列印介質30之第一側向邊緣區35相對的第二側向邊緣區37上，在圖式中，該第二側向邊緣區在列印介質30之右側。In addition, the trigger code 36 is printed on a second lateral edge area 37 of the printing medium 30 opposite to the first lateral edge area 35 by the first printing unit 16. In the figure, the second lateral edge area is on the right side of the printing medium 30.
觸發碼34、36係具有沿著豎直方向之相異簽名且包含具有水平邊緣之記號的碼。The trigger codes 34, 36 are codes having different signatures along the vertical direction and including marks having horizontal edges.
第一側向邊緣區35及第二側向邊緣區37上之觸發碼34、36經定位以相對於列印介質30之行進方向32與彼此相距豎直距離。The trigger codes 34 , 36 on the first lateral edge region 35 and the second lateral edge region 37 are positioned at a vertical distance from each other relative to the travel direction 32 of the print medium 30 .
在圖式中，藉由一個列印單元列印之記號由相同陰影指示。實際上，藉由一個列印單元列印之記號具有相同色彩。In the drawings, marks printed by one printing unit are indicated by the same shading. Actually, marks printed by one printing unit have the same color.
第一列印單元16亦將第一套準記號38列印在第一側向邊緣區35上且將第二套準記號40列印在第二側向邊緣區37上。The first printing unit 16 also prints a first registration mark 38 on the first lateral edge region 35 and a second registration mark 40 on the second lateral edge region 37.
第一套準記號38及第二套準記號40列印至觸發碼34、36之後。因此，套準記號38、40經定位以與觸發碼34、36相距豎直距離。The first registration mark 38 and the second registration mark 40 are printed after the trigger codes 34, 36. Therefore, the registration marks 38, 40 are positioned to be spaced vertically from the trigger codes 34, 36.
界定第一套準記號38及第二套準記號40與各別觸發碼34、36之間的距離。The distances between the first registration mark 38 and the second registration mark 40 and the respective trigger codes 34 and 36 are defined.
圖4展示在放大視圖中列印在第一側向邊緣區35上之第一套準記號38。FIG. 4 shows the first registration mark 38 printed on the first lateral edge region 35 in an enlarged view.
第一套準記號38具有水平邊緣42及傾向水平邊緣42之邊緣44。在所描繪之實施例中，第一套準記號38係直角三角形。The first alignment mark 38 has a horizontal edge 42 and an edge 44 that is inclined toward the horizontal edge 42. In the depicted embodiment, the first alignment mark 38 is a right triangle.
此外，各別光電池28之感測器路徑在圖4中藉助於虛線可視化。Furthermore, the sensor paths of the individual photocells 28 are visualized in FIG. 4 by means of dashed lines.
列印在第一側向邊緣區35上的第一套準記號38之寬度覆蓋列印介質30之位置的最大橫向誤差。The width of the first registration mark 38 printed on the first lateral edge region 35 covers the maximum lateral error of the position of the print medium 30.
舉例而言，第一套準記號38具有6 mm之寬度w。For example, the first registration mark 38 has a width w of 6 mm.
在實施例中，第二側向邊緣區37上之第二套準記號40與第一側向邊緣區35上之第一套準記號38具有相同形狀。In an embodiment, the second registration mark 40 on the second lateral edge region 37 has the same shape as the first registration mark 38 on the first lateral edge region 35.
第一套準記號38及第二套準記號40兩者皆為二維套準記號。Both the first registration mark 38 and the second registration mark 40 are two-dimensional registration marks.
然而，第二側向邊緣區35上之第二套準記號40亦可為一維套準記號，例如正方形或矩形。However, the second registration mark 40 on the second lateral edge region 35 may also be a one-dimensional registration mark, such as a square or a rectangle.
當列印介質30沿著行進方向行進且具有觸發碼34、36之區段進入第二列印單元18時，觸發碼34、36由偵測單元26讀取，而第二列印單元18未列印，此意謂列印輥筒24不與列印介質30接觸。When the print medium 30 travels along the travel direction and the section with the trigger codes 34, 36 enters the second print unit 18, the trigger codes 34, 36 are read by the detection unit 26, and the second print unit 18 does not print, which means that the print roller 24 does not contact the print medium 30.
藉由讀取觸發碼34、36，對齊過程開始。By reading the trigger codes 34, 36, the alignment process begins.
在讀取觸發碼34之後，偵測單元26偵測第一側向邊緣區35上之第一套準記號38。After reading the trigger code 34 , the detection unit 26 detects the first registration mark 38 on the first lateral edge region 35 .
當第一套準記號38沿著各別光電池28行進時，可藉由偵測水平邊緣42之位置判定第一套準記號38之豎直位置。The vertical position of the first set of alignment marks 38 can be determined by detecting the position of the horizontal edge 42 as the first set of alignment marks 38 travels along the respective photocells 28 .
可藉由偵測第一套準記號38之長度l判定第一套準記號38之水平位置，如圖4中所指示。經偵測長度l歸因於邊緣44傾向水平邊緣42而對於第一套準記號38之水平位置係特定的。較佳地，使邊緣44傾向水平邊緣42之角度介於40°與50°之間，詳言之45°。此範圍中之角度確保高精度。The horizontal position of the first registration mark 38 can be determined by detecting the length l of the first registration mark 38, as indicated in FIG4. The detected length l is specific to the horizontal position of the first registration mark 38 due to the inclination of the edge 44 to the horizontal edge 42. Preferably, the angle at which the edge 44 inclines to the horizontal edge 42 is between 40° and 50°, in particular 45°. Angles in this range ensure high accuracy.
在判定第一側向邊緣區35上之第一套準記號38的水平及豎直位置之後，基於第一套準記號38之位置調整豎直及/或水平套準。After determining the horizontal and vertical positions of the first registration mark 38 on the first lateral edge region 35, the vertical and/or horizontal registration is adjusted based on the position of the first registration mark 38.
在基於第一套準記號38之位置調整豎直及/或水平套準之後，藉由第二列印單元18在列印介質30之第一側向邊緣區35上列印第三套準記號46，且在第二側向邊緣區37上列印第四套準記號48。After adjusting the vertical and/or horizontal registration based on the position of the first registration mark 38, the second printing unit 18 prints a third registration mark 46 on the first lateral edge area 35 of the print medium 30 and prints a fourth registration mark 48 on the second lateral edge area 37.
藉由第二列印單元18列印之第三套準記號46及第四套準記號48的形狀對應於藉由第一列印單元16列印之第一套準記號38及第二套準記號40的形狀。然而，不同形狀亦為可能的。The shapes of the third and fourth registration marks 46 and 48 printed by the second printing unit 18 correspond to the shapes of the first and second registration marks 38 and 40 printed by the first printing unit 16. However, different shapes are also possible.
歸因於先前調整，藉由第二列印單元18列印之第三套準記號46及第四套準記號48的水平及豎直位置已明確界定。Due to the previous adjustment, the horizontal and vertical positions of the third registration mark 46 and the fourth registration mark 48 printed by the second printing unit 18 are clearly defined.
由於明確界定之位置，單色光電池可基於其位置判定哪個列印單元產生套準記號。Due to the clearly defined position, the monochrome photocells can determine which print unit generates the registration mark based on their position.
在下一步驟中，量測藉由第一列印單元16及第二列印單元18列印在第一側向邊緣區35上之第一套準記號38及第三套準記號46之間的豎直距離v 1，且量測藉由第一列印單元16及第二列印單元18列印在第二側向邊緣區37上之第二套準記號40及第四套準記號48之間的豎直距離v 2。比較套準記號之間的豎直距離v 1及v 2以偵測第一列印單元16與第二列印單元18之間的偏斜。 In the next step, the vertical distance v1 between the first registration mark 38 and the third registration mark 46 printed on the first lateral edge area 35 by the first printing unit 16 and the second printing unit 18 is measured, and the vertical distance v2 between the second registration mark 40 and the fourth registration mark 48 printed on the second lateral edge area 37 by the first printing unit 16 and the second printing unit 18 is measured. The vertical distances v1 and v2 between the registration marks are compared to detect the skew between the first printing unit 16 and the second printing unit 18.
特定言之，若距離v 1與v 2彼此不同，則偏斜校正為必要的。 In particular, if the distances v1 and v2 are different from each other, a deflection correction is necessary.
判定第一列印單元16與第二列印單元18之間的偏斜程度，且藉由樞轉位於第一列印單元16之列印輥筒24與第二列印單元18之列印輥筒25之間的偏斜輥筒22調整偏斜。The degree of skew between the first printing unit 16 and the second printing unit 18 is determined, and the skew is adjusted by pivoting the skew roller 22 between the print roller 24 of the first printing unit 16 and the print roller 25 of the second printing unit 18 .
在替代實施例中，可量測套準記號46、48分別相對於觸發碼34、36或相對於其他參考點之豎直距離，以便偵測偏斜。In alternative embodiments, the vertical distances of the registration marks 46, 48 relative to the trigger codes 34, 36, respectively, or relative to other reference points may be measured to detect skew.
在視情況選用的方法步驟中，量測藉由第一列印單元16列印在第二側向邊緣區37上之第二套準記號40的水平及/或豎直位置，且再次基於第二套準記號40在第二側向邊緣區37上之位置調整豎直及/或水平套準。由此，色彩平面之對齊可甚至更準確。In an optional method step, the horizontal and/or vertical position of a second registration mark 40 printed by the first printing unit 16 on the second lateral edge region 37 is measured, and the vertical and/or horizontal registration is adjusted again based on the position of the second registration mark 40 on the second lateral edge region 37. Thereby, the alignment of the color planes can be even more accurate.
關於第一列印單元16及第二列印單元18描述之方法步驟可經重複以用於列印裝置之後續列印單元。The method steps described with respect to the first printing unit 16 and the second printing unit 18 may be repeated for subsequent printing units of the printing device.
第二側向邊緣區37上之第二套準記號40及第四套準記號48的最大寬度小於第一側向邊緣區35上之第一套準記號38及第三套準記號46的最大寬度，詳言之介於第一側向邊緣區35上之第一套準記號38及第三套準記號46之寬度的三分之一至三分之二之間。The maximum width of the second registration mark 40 and the fourth registration mark 48 on the second lateral edge region 37 is smaller than the maximum width of the first registration mark 38 and the third registration mark 46 on the first lateral edge region 35, specifically, between one third and two thirds of the width of the first registration mark 38 and the third registration mark 46 on the first lateral edge region 35.
舉例而言，當使用在介質之兩側35、37上具有相同位向之相同光電池28、29時，第二側向邊緣區37上之套準記號40、48之最大寬度為4 mm。在另一實例中，當使用具有沿著橫向方向之較窄敏感區域的光電池29時，第二側向邊緣區37上之套準記號40、48之最大寬度為2 mm。For example, when using the same photocells 28, 29 with the same orientation on both sides 35, 37 of the medium, the maximum width of the registration marks 40, 48 on the second lateral edge region 37 is 4 mm. In another example, when using a photocell 29 with a narrower sensitive area along the transverse direction, the maximum width of the registration marks 40, 48 on the second lateral edge region 37 is 2 mm.
較小寬度係可能的，此係因為在第一次對齊之後，最大橫向誤差減小。此外，量測第二側向邊緣區37上之套準記號40、48的水平位置，但不必量測豎直位置。此亦促成第二側向邊緣區37上之套準記號40、48的較小可能寬度。Smaller widths are possible because the maximum lateral error is reduced after the first alignment. In addition, the horizontal position of the registration marks 40, 48 on the second lateral edge region 37 is measured, but the vertical position does not need to be measured. This also contributes to the smaller possible width of the registration marks 40, 48 on the second lateral edge region 37.
藉此，列印過程中產生的廢料減少。This reduces waste generated during the printing process.
詳言之，具有套準記號之側向邊緣區35、37並不促成最終列印且在列印過程之後切除。In detail, the lateral edge areas 35, 37 with registration marks do not contribute to the final printing and are cut off after the printing process.
圖5顯現偵測單元26之光電池28、29的感測器路徑，特定言之，光電池28、29之敏感區域之路徑。FIG. 5 shows the sensor paths of the photocells 28 , 29 of the detection unit 26 , and more specifically, the paths of the sensitive areas of the photocells 28 , 29 .
光電池28、29之敏感區域為矩形。The sensitive areas of the photocells 28 and 29 are rectangular.
舉例而言，光電池之敏感區域為2 mm x 1 mm。For example, the sensitive area of a photocell is 2 mm x 1 mm.
圖5展示第二光電池29之寬度小於第一光電池28。FIG. 5 shows that the width of the second photovoltaic cell 29 is smaller than that of the first photovoltaic cell 28 .
舉例而言，光電池28、29相同，但第二光電池29相對於第一光電池28轉動約90°。特定言之，在第一側向邊緣區上之較大套準記號38、46上以水平位向使用光電池28，且在第二側向邊緣區上之較小記號40、48上以豎直位向使用第二光電池29。For example, the photocells 28, 29 are identical, but the second photocell 29 is rotated approximately 90° relative to the first photocell 28. Specifically, the photocell 28 is used in a horizontal orientation on the larger registration marks 38, 46 on the first lateral edge region, and the second photocell 29 is used in a vertical orientation on the smaller marks 40, 48 on the second lateral edge region.
在另一實例中，光電池28、29不同，其中第二光電池29相較於第一光電池28具有較小敏感區域。In another example, the photocells 28 , 29 are different, wherein the second photocell 29 has a smaller sensitive area than the first photocell 28 .
歸因於列印介質30之位置的橫向誤差，添加到光電池28之敏感區域的寬度之介質30的第一側35上之套準記號38、46之寬度必須至少略大於初始橫向位置誤差容許度，藉此確保記號越過光電池28之敏感區域。套準記號38、46之寬度較佳地至少與光電池28之敏感區域的寬度一樣大，以確保套準記號38、46完全越過光電池28之敏感區域。因此，套準記號38、46之寬度較佳地略大於光電池28之敏感區域的寬度。其同樣適用於介質之第二側37，亦即套準記號40、48及光電池29。但由於第二側37上之橫向誤差容許度較小，此係因為在基於介質之第一側35上之記號的初始橫向對齊之後應用，可使得介質之第二側37上之記號的大小較小。Due to the lateral error in the position of the print medium 30, the width of the registration marks 38, 46 on the first side 35 of the medium 30 added to the width of the sensitive area of the photocell 28 must be at least slightly larger than the initial lateral position error tolerance to ensure that the marks pass over the sensitive area of the photocell 28. The width of the registration marks 38, 46 is preferably at least as large as the width of the sensitive area of the photocell 28 to ensure that the registration marks 38, 46 completely pass over the sensitive area of the photocell 28. Therefore, the width of the registration marks 38, 46 is preferably slightly larger than the width of the sensitive area of the photocell 28. The same applies to the second side 37 of the medium, i.e., the registration marks 40, 48 and the photocell 29. However, since the lateral error tolerance on the second side 37 is smaller, this is because it is applied after the initial lateral alignment of the mark on the first side 35 of the medium, which can make the size of the mark on the second side 37 of the medium smaller.
歸因於第二套準記號40及第四套準記號48之水平位置已根據第一側向邊緣區35上的第一套準記號38及第三套準記號46之位置設定，水平位置中之誤差在1 mm之範圍內。Since the horizontal positions of the second registration mark 40 and the fourth registration mark 48 have been set according to the positions of the first registration mark 38 and the third registration mark 46 on the first lateral edge area 35, the error in the horizontal position is within the range of 1 mm.
10:列印裝置 12:退繞機 14:預加熱單元 16:第一列印單元 18:第二列印單元 20:乾燥器 21,22:偏斜輥筒 23:箭頭 24,25:列印輥筒 26:光學偵測單元/偵測單元 28,29:光電池/攝像頭 30:列印介質 32:箭頭/行進方向 34,36:觸發碼 35:第一側向邊緣區/第一側 37:第二側向邊緣區/第二側 38:第一套準記號 40:第二套準記號 42:水平邊緣 44:邊緣 46:第三套準記號 48:第四套準記號 l:長度 v 1,v 2:豎直距離 w:寬度 10: Printing device 12: Unwinder 14: Preheating unit 16: First printing unit 18: Second printing unit 20: Dryer 21, 22: Deflection roller 23: Arrow 24, 25: Printing roller 26: Optical detection unit/detection unit 28, 29: Photocell/Camera 30: Printing medium 32: Arrow/travel direction 34, 36: Trigger code 35: First lateral edge area/first side 37: Second lateral edge area/second side 38: First alignment mark 40: Second alignment mark 42: Horizontal edge 44: Edge 46: Third alignment mark 48: Fourth alignment mark l: Length v 1 , v 2 : Vertical distance w: Width
其他特徵及優勢可根據以下描述及隨附圖式而變得顯而易見。在圖式中： - [圖1]示意性地展示本發明列印裝置， - [圖2]展示圖1之列印裝置之列印單元， - [圖3]展示列印圖案， - [圖4]展示套準記號，以及 - [圖5]展示感測器路徑。 Other features and advantages will become apparent from the following description and from the accompanying drawings. In the drawings: - [FIG. 1] schematically shows a printing device of the present invention, - [FIG. 2] shows a printing unit of the printing device of FIG. 1, - [FIG. 3] shows a printed pattern, - [FIG. 4] shows a registration mark, and - [FIG. 5] shows a sensor path.
30:列印介質 30: Printing media
32:箭頭/行進方向 32: Arrow/direction of travel
34,36:觸發碼 34,36: Trigger code
35:第一側向邊緣區/第一側 35: First lateral edge area/first side
37:第二側向邊緣區/第二側 37: Second lateral edge area/second side
38:第一套準記號 38: The first set of standard symbols
40:第二套準記號 40: The second set of standard symbols
46:第三套準記號 46: The third set of standard symbols
48:第四套準記號 48: The fourth set of standard symbols
v1,v2:豎直距離 v 1 ,v 2 : vertical distance
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