JP-7856999-B2 - Multifunction printer and multifunction printing method

JP7856999B2JP 7856999 B2JP7856999 B2JP 7856999B2JP-7856999-B2

Inventors

森川亮
久保寛次
岩藤浩充
岩本好司
磯崎徹
片岡啓治
丹生谷貴弘
熊谷怜志
松永真一
村上徹

Assignees

富士機械工業株式会社

Dates

Publication Date: 20260512
Application Date: 20220118

Claims (2)

An inkjet printing unit that prints images and pitch adjustment marks printed for each image onto the web using inkjet printing, A gravure printing unit that prints an image onto the aforementioned web by gravure printing, A detection unit for detecting the pitch adjustment marks, A tension adjustment unit for adjusting the tension of the web printed by the inkjet printing unit, It comprises a control unit that controls the printing pitch, The tension adjustment unit is, The system includes an infeed roll positioned upstream of the inkjet printing unit and transporting the web to the inkjet printing unit, and a suction roll positioned downstream of the inkjet printing unit and transporting the web printed by the inkjet printing unit to a downstream process. The control unit, Based on the pitch adjustment marks detected by the detection unit, the inkjet printing pitch, which is the printing pitch of the inkjet printing unit, is calculated. Without changing the rotation speed of the plate cylinder of the gravure printing unit, Based on the pitch deviation, which is the difference between the gravure printing pitch (the printing pitch of the gravure printing unit) and the inkjet printing pitch, the rotational speed of the infeed roll and the suction roll of the tension adjustment unit is controlled to adjust the tension of the web being transported by the inkjet printing unit, thereby controlling the inkjet printing pitch. A multifunction printing press characterized by the following features.
A pitch adjustment mark printing step involves printing the image and pitch adjustment marks, which are printed for each image, onto the web using inkjet printing. A pitch deviation calculation step that detects the pitch adjustment marks and calculates the inkjet printing pitch, and calculates the pitch deviation amount which is the difference between the gravure printing pitch, which is the printing pitch of the gravure printing unit that prints the image on the web by gravure printing, and the inkjet printing pitch. A pitch control step includes controlling the inkjet printing pitch by adjusting the tension of the web related to the inkjet printing, without changing the rotation speed of the plate cylinder of the gravure printing unit , by controlling the rotation speed of an infeed roll positioned upstream of the inkjet printing unit and transporting the web to the inkjet printing unit, and a suction roll positioned downstream of the inkjet printing unit and transporting the web printed by the inkjet printing unit to a downstream process, based on the amount of pitch deviation, without changing the rotation speed of the plate cylinder of the gravure printing unit. A composite printing method characterized by the following features.

Description

This invention relates to a multifunction printing machine and a multifunction printing method. Conventionally, as a printing press for multi-color printing, a composite printing press has been developed that includes a gravure printing device capable of high-quality printing using a plate cylinder and an inkjet printing device capable of low-cost printing without using a plate cylinder (for example, Patent Document 1). Japanese Patent Publication No. 2014-166713 This is a schematic diagram of a multifunction printer according to Embodiment 1 of the present invention.This is a front view showing the configuration of a gravure printing unit according to Embodiment 1.This is a functional block diagram of the control unit according to Embodiment 1.This flowchart shows the flow of pitch control according to Embodiment 1.This figure shows examples of patterns and registration marks.This is a functional block diagram of the control unit according to Embodiment 2.This is a flowchart showing the pitch control flow according to Embodiment 2.This flowchart shows the flow of pitch control related to the modified example.This is a functional block diagram of the control unit according to Embodiment 3.This flowchart shows the flow of pitch control according to Embodiment 3. The following description, with reference to the figures, will explain a composite printing machine and composite printing method comprising an inkjet printing apparatus and a gravure printing apparatus according to an embodiment of the present invention. (Embodiment 1) As shown in the schematic diagram of Figure 1, the composite printing press 1 according to this embodiment includes an unwinding device 11 for unwinding a roll of web W, an infeed roll 12 for sending the web W unwinded from the unwinding device 11 to the printing press, an inkjet printing unit 20 for performing inkjet printing on the web W sent from the unwinding device 11, an intermediate feed roll 13 for transporting the inkjet-printed web W to a gravure printing unit 30, a gravure printing unit 30 for performing gravure printing on the web W transported from the intermediate feed roll 13, an outfeed roll 14 for transporting the gravure-printed web W to a winding device 15, a winding device 15 for winding the printed web W, detection units 41 and 42 for detecting marks for pitch alignment and registration, and a control unit 50 (not shown). Web W is a long-length printing medium. While the material of Web W is not particularly limited, Web W in this embodiment is a plastic film such as biaxially oriented polypropylene (OPP) or polyethylene terephthalate (PET), commonly used in food packaging films. As a plastic film, Web W is susceptible to expansion and contraction due to ambient temperature, tension fluctuations, etc., and generally prone to defects such as misalignment and pitch misalignment. The unwinding device 11 is a device that feeds the web W, which is set in a roll state, to the inkjet printing unit 20. The infeed roll 12 transports the web W unwound from the unwinding device 11 to the inkjet printing unit 20. The infeed roll 12 is equipped with a drive mechanism and transports the web W at a set feed speed. The inkjet printing unit 20 comprises a pre-coat section 21, a pre-coat drying section 22, an inkjet printing section 23, a suction roll 24, and an inkjet printing drying section 25. The pre-coat section 21 applies the pre-coat liquid to the coated surface of the web W unwound from the unwinding device 11, forming a pre-coat layer on the coated surface. The pre-coat drying section 22 is located downstream of the pre-coat section 21 with respect to the web W's transport direction. The pre-coat drying section 22 dries the pre-coat liquid applied to the coated surface of the web W in the pre-coat section 21. The inkjet printing unit 23 is positioned downstream of the pre-coat drying unit 22 with respect to the transport direction of the web W. The inkjet printing unit 23 includes multiple print heads 231, each performing printing for a different color. The inkjet printing unit 23 forms the image by depositing ink ejected from the print heads 231 onto the coated surface of the web W (specifically, the pre-coat layer formed on the coated surface). The inkjet printing unit 23 in this embodiment is equipped with four print heads 231 and prints a pattern in four colors—cyan (C), magenta (M), yellow (Y), and black (K)—and registration marks RM (color contact marks) onto the web W. The registration marks RM are used to detect and correct misalignment in the printing of each color. The inkjet-printed web W is transported to the downstream inkjet printing drying section 25 by the suction roll 24. Since the suction roll 24 transports the web W by suction, it can stably transport the web W without contacting the printed surface. Furthermore, by adjusting the rotational speed of the infeed roll 12 and the suction roll 24, the tension of the web W passing through the inkjet printing s