Inkjet printing method, device, computer equipment and storage medium for production date

Abstract

The present invention relates to an inkjet printing method, device, computer equipment and storage medium for production date. The method comprises: S10: converting the identification code of a product into an identification expression of a base other than decimal; S20: replacing the digits in the identification expression with dots of different colors according to the correspondence between different digits and colors to obtain an implicit identification code; S30: arranging the implicit identification code into a pattern dot matrix of the production date to be printed on the product according to a preset rule; S40: splitting the pattern dot matrix according to color to obtain multiple groups of printing dot matrixes of different colors; S50: distributing multiple groups of printing dot matrixes to print heads of corresponding ink colors. Compared with the prior art, the production date obtained by the printing of the present invention not only hides the identification code information of the product, but also the printing character height will not exceed the requirements of the product outer packaging.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet printing, and in particular to an inkjet printing method, device, computer equipment and storage medium for production date. Background Art

[0002] Channeling, also known as rushing or reverse trading, mainly refers to a dealer in a certain region selling his own products to another dealer’s region of the same brand. This phenomenon usually stems from differences in brand regional sales policies. In order to gain more profits, dealers often take advantage of these differences to sell cross-regional products at low prices. This behavior not only harms the interests of most dealers, but also undermines market stability and brand value.

[0003] In order to prevent the circulation of goods in parallel, Chinese patent CN117173000A discloses an information hiding method based on quaternary coding. By performing quaternary conversion on the hidden elements, a corresponding quaternary expression is obtained. According to the quaternary expression, the corresponding graphics are obtained from a corresponding library containing four different graphics. The obtained graphics are combined into a hidden code of the element to be hidden. The hidden codes of multiple single characters are arranged in sequence to form preset text, which can effectively hide the information in the text required for the product.

[0004] See also Figure 1 , the preset text "4" is composed of multiple different graphics. When inkjet printing, multiple ink dots constitute a graphic, and multiple graphics constitute the preset text. When conventional methods are used for inkjet printing, the preset text is directly composed of ink dots. Obviously, the font height of the preset text obtained by inkjet printing using the above information hiding method is relatively large. In particular, when a continuous ink jet (CIJ) printer is used to print the preset text on the product packaging, since the diameter of a single ink dot is about 0.2 mm, the font height of the preset text will exceed the packaging requirements. Summary of the invention

[0005] Based on this, the object of the present invention is to provide an inkjet printing method, device, computer equipment and storage medium for production date.

[0006] In a first aspect, the present invention provides an inkjet printing method for a production date, comprising:

[0007] S10: converting the identification code of the product into an identification expression of a base other than decimal;

[0008] S20: According to the correspondence between different numbers and colors, the numbers in the identification expression are replaced with dots of different colors to obtain an identification hidden code;

[0009] S30: Arranging the hidden identification code into a pattern dot matrix of the production date to be printed on the product according to a preset rule;

[0010] S40: splitting the pattern dot matrix according to colors to obtain multiple groups of printing dot matrixes of different colors;

[0011] S50: Distribute the plurality of groups of printing dot arrays to the print heads of corresponding ink colors.

[0012] Compared with the prior art, the present invention converts the identification code containing the product pre-sale location information into binary system, replaces different digital numbers with dots of corresponding colors, and then arranges the dots of different colors into a pattern dot matrix to be printed with the production date. When printing, the pattern dot matrix is ​​split into multiple groups of printing dot matrices of different colors, and then the printing dot matrix is ​​distributed to the print head of the corresponding color. Since the dots in the printing dot matrix can be printed by a single ink dot, the character height of the production date containing the product pre-sale location information printed by the CIJ inkjet printer is the same as that of conventional printing, and will not exceed the requirements of the product outer packaging.

[0013] In one embodiment, step S10 includes:

[0014] S11: Split the product identification code into individual characters / words;

[0015] S12: Obtain the hexadecimal representation of each character / word in the ASCII code comparison table;

[0016] S13: converting the hexadecimal representation into a representation in a system other than decimal;

[0017] S14: According to the combination order of the identification code, combine the representations of the characters / words in bases other than the decimal system to obtain identification expressions of the identification code in bases other than the decimal system.

[0018] In one of the embodiments, in step S30, the identification hidden code is arranged into a pattern dot matrix of the production date to be printed of the product according to the stroke sequence of the production date to be printed.

[0019] In one embodiment, step S30 includes:

[0020] S31: Obtaining the printing dot matrix of the production date to be printed on the product;

[0021] S32: The topmost dot matrix in the first column of the printing dot matrix is ​​used as the first dot matrix, and is replaced with the identification hidden code in order from top to bottom and from left to right to obtain a pattern dot matrix of the production date to be printed on the product.

[0022] In one embodiment, it also includes:

[0023] S60: convert the product identification code into a corresponding binary expression; arrange the binary expression in the dot matrix gaps of the product's production date to be printed in a preset order; distribute the printing dot matrix corresponding to the digital "1" to a print head filled with transparent ink.

[0024] In one of the embodiments, in step S60, the printing dot matrix corresponding to the digital number "0" is distributed to the print head filled with transparent ink.

[0025] In a second aspect, the present invention provides an inkjet printing device for production date, comprising:

[0026] An identification code conversion module, used to convert the identification code of the product into an identification expression of a base other than decimal;

[0027] The implicit code conversion module is used to replace the numbers in the identification expression with dots of different colors according to the corresponding relationship between different numbers and colors to obtain the identification implicit code;

[0028] A pattern dot matrix arrangement module, used to arrange the identification hidden code into a pattern dot matrix of the product's production date to be printed according to a preset rule;

[0029] A printing dot matrix splitting module is used to split the pattern dot matrix according to color to obtain multiple groups of printing dot matrices of different colors;

[0030] The printing dot matrix distribution module is used to distribute multiple groups of the printing dot matrix to the nozzles of corresponding colors.

[0031] In a third aspect, the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any of the above methods when executing the computer program.

[0032] In a fourth aspect, the present invention provides a computer storage medium, comprising a computer program, wherein the computer program is used to implement any of the methods described above when executed by a controller.

[0033] In a fifth aspect, the present invention provides an inkjet printing system for production date, comprising a plurality of print heads and the inkjet printing device for production date as described above; the plurality of print heads are arranged in sequence and side by side above the production line along the production line direction, and the ink colors of the plurality of print heads are different; the inkjet printing device for production date is separately connected to the plurality of print heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a preset text generated by the prior art and arranged in sequence;

[0035] Figure 2A schematic diagram of the structure of an inkjet printing system for the production date according to an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of an inkjet printing device for producing a date according to an embodiment of the present invention;

[0037] Figure 4 A schematic flow chart of an inkjet printing method for a production date according to an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of an identification hidden code according to an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of a printing dot matrix for printing a production date according to an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of a pattern dot matrix to be printed with a production date according to an embodiment of the present invention;

[0041] Figure 8 A schematic diagram of a printing dot matrix according to an embodiment of the present invention;

[0042] Fig. 9 A schematic diagram of a printing dot matrix of a production date to be printed in a grid according to an embodiment of the present invention;

[0043] Fig.10 A schematic diagram of a binary expression of a product identification code according to an embodiment of the present invention arranged in a pattern dot matrix of a production date to be printed;

[0044] Fig.11 Schematic diagram of a transparent ink printing dot matrix according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0046] In order to solve the problem of channeling, the prior art converts the identification code containing the pre-sale location information of the product into a base-to-base conversion to obtain the corresponding hidden code, and arranges the hidden code into a pattern dot matrix of the product's production date to be printed, so that the pre-sale location information of the product can be hidden on the production date of the product's outer packaging. In order to achieve the hiding of the pre-sale location information, the hidden code is composed of different graphics. In other words, the printed production date is composed of a graphic containing multiple ink dots. When a CIJ inkjet printer is used, the diameter of a single ink dot is about 0.2 mm, and the height of the printed production date will exceed the requirements of the product's outer packaging.

[0047] Based on this, the present invention replaces the graphics in the implicit code with dots of different colors, so that the pattern dot matrix of the production date to be printed is composed of dots of different colors. When printing, the pattern dot matrix is ​​split into multiple groups of printing dot matrixes of different colors, and then the printing dot matrix is ​​distributed to the print head of the corresponding color. Since the dots in the printing dot matrix can be printed by a single ink dot, the character height of the production date containing the product pre-sale location information printed by the CIJ inkjet printer is the same as that of conventional printing, and will not exceed the requirements of the product outer packaging.

[0048] See also Figure 2 The inkjet printing system of the production date of the present invention comprises a plurality of print heads 100 and an inkjet printing device 200 for the production date. The plurality of print heads 100 are arranged in parallel above the production line in the production line direction, and the production date is printed on the outer packaging of the product transmitted on the production line. The ink colors of the plurality of print heads 100 are different. The inkjet printing device 300 for the production date is separately connected to the plurality of print heads 100, and print dot arrays of different colors are distributed to the print heads 100 of the corresponding ink colors.

[0049] See also Figure 3 and Figure 4 The inkjet printing device 200 for producing date of the present invention comprises an identification code conversion module 201, an implicit code conversion module 202, a pattern dot matrix arrangement module 203, a printing dot matrix splitting module 204 and a printing dot matrix distribution module 205.

[0050] The identification code conversion module 201 is used to execute step S10: converting the identification code of the product into an identification expression in a base other than decimal.

[0051] The product identification code is a digital information encoding method that can be used to uniquely identify and track the product. Generally, the identification code is composed of at least one of characters and text, and the characters include numbers, letters and symbols. In the present invention, the product identification code includes the pre-sale location information of the product.

[0052] In order to hide the information such as the pre-sale location in the identification code, the present invention converts the product identification code into an expression of other bases other than decimal, including but not limited to binary, ternary, quaternary, etc. Specifically, step S10 includes:

[0053] S11: Split the product identification code into individual characters / words;

[0054] S12: Obtain the hexadecimal representation of each character / word in the ASCII code comparison table;

[0055] S13: converting the hexadecimal representation into other base representations other than decimal;

[0056] S14: According to the combination order of the identification code, combine the representations of the characters / words in bases other than the decimal system to obtain the identification expressions of the identification code in bases other than the decimal system.

[0057] Among them, ASCII (American Standard Code for Information Interchange) is a set of character encodings based on Latin letters and is the world's most common information exchange standard. The ASCII code comparison table includes a total of 128 characters, and the hexadecimal representation corresponding to each character can be queried. Therefore, the ASCII code comparison table can be used to convert the product identification code. It should be noted that when the identification code is split into text, the text must first be converted through unicode encoding, and then the corresponding hexadecimal representation must be found in the ASCII code comparison table.

[0058] In order to hide the identification code and reduce the burden on the system as much as possible, this embodiment converts the product identification code into a corresponding binary expression. Taking the product identification code "2623" as an example, when converting it into the corresponding binary expression, the product identification code "2623" is first split into individual characters "2", "6", "2", and "3"; the hexadecimal representation of the character "2" in the ASCII code comparison table is "32", the hexadecimal representation of the character "6" in the ASCII code comparison table is "36", and the hexadecimal representation of the character "3" in the ASCII code comparison table is "33"; the hexadecimal representation "32" is converted into a binary representation of "00110010", the hexadecimal representation "36" is converted into a binary representation of "00110011", and the hexadecimal representation "33" is converted into a binary representation of "00110011"; according to the combination order of each character in the identification code "2623", the binary expression of the identification code is "00110010001101100011001000110011".

[0059] The implicit code conversion module 202 is used to execute step S20: according to the correspondence between different numbers and colors, the numbers in the identification expression are replaced with dots of different colors to obtain the identification implicit code.

[0060] In order to further hide the information of the identification code without affecting the height of the printed characters, the present invention distinguishes different numbers by different colors, and replaces the numbers in the expression obtained in step S10 with dots of different colors to obtain a hidden code. Figure 5 , replace the “0” in the binary expression “00110010001101100011001000110011” with black dots and replace the “1” with red dots to get the corresponding hidden code.

[0061] The pattern dot matrix arrangement module 203 is used to execute step S30: according to a preset rule, the identification hidden code is arranged into a pattern dot matrix of the production date to be printed on the product.

[0062] The present invention does not make any specific limitation on the preset rules, as long as the implicit code can be arranged into a pattern dot matrix of the production date to be printed. For example, the implicit code can be arranged in the stroke order of the production date to be printed to obtain the pattern dot matrix of the production date to be printed; or, according to the printed dot matrix of the production date to be printed, the top dot matrix in the first column of the printed dot matrix is ​​used as the first dot matrix, and is replaced with the implicit code in order from top to bottom and from left to right to obtain the pattern dot matrix of the production date to be printed; and so on.

[0063] Take printing "2024" as an example. Figure 6 The printed dot matrix is ​​shown in the figure. Take the top dot matrix in the first column of the printed dot matrix as the first dot matrix, and then in the order from top to bottom and from left to right, Figure 5 Replace the implicit code shown in Figure 7 The pattern dot matrix corresponding to the "2" shown.

[0064] The printing dot matrix splitting module 204 is used to execute step S40: splitting the pattern dot matrix according to color to obtain multiple groups of printing dot matrices with different colors.

[0065] The printing dot matrix distribution module 205 is used to execute step S50: distribute multiple groups of printing dot matrixes to the print heads of corresponding ink colors.

[0066] Existing inkjet printers generally print in monochrome and cannot directly print the pattern dot matrix in step S30. Therefore, the present invention splits the pattern dot matrix in step S30 according to color to obtain printing dot matrices of different colors, which are then distributed to the print heads of corresponding ink colors.

[0067] by Figure 7Taking the pattern dot matrix shown in the figure as an example, the inkjet printing system of the production date includes a first print head and a second print head, the first print head prints black ink, and the second print head prints red ink. Figure 8 The inkjet printing device of the production date splits the pattern dot matrix of the image into black printing dot matrix and red printing dot matrix, distributes the black printing dot matrix to the first print head, and distributes the red printing dot matrix to the second print head.

[0068] In the prior art, the inkjet printer prints according to the printing dot matrix of the text or pattern to be printed. Specifically, the smallest printing unit of the inkjet printer is an ink dot, and one dot in the printing dot matrix of the text or pattern to be printed corresponds to one printed ink dot. The inkjet printer prints by column in the time domain, that is, it prints one column of ink dots at a time. Generally, the items to be printed move relative to the inkjet printer on the production line. The inkjet printer can calculate the column spacing based on the time interval or encoder pulse, thereby determining the timing of column printing. The inkjet printer prints one column at a time according to the printing timing, and finally prints out the complete text or pattern. For example, when the item to be printed moves to the left relative to the inkjet printer, the inkjet printer prints column by column from left to right according to the printing dot matrix.

[0069] In this embodiment, the printing timing can be calculated based on the print dot matrix of the first print head and the second print head, and the ink dots printed by the first print head and the second print head can be superimposed to obtain the production date of the product to be printed, and the production date obtained by printing contains the pre-sale location information. When the sales location information needs to be verified, the production date on the item can be scanned by any scanning device in the prior art, and decoded according to the arrangement rules of the production date pattern dot matrix and the conversion rules of the identification hidden code, so as to obtain the pre-sale location information.

[0070] Compared with the prior art, the present invention converts the identification code containing the product pre-sale location information into binary system, replaces different digital numbers with dots of corresponding colors, and then arranges the dots of different colors into a pattern dot matrix to be printed with the production date. When printing, the pattern dot matrix is ​​split into multiple groups of printing dot matrices of different colors, and then the printing dot matrix is ​​distributed to the print head of the corresponding color. Since the dots in the printing dot matrix can be printed by a single ink dot, the character height of the production date containing the product pre-sale location information printed by the CIJ inkjet printer is the same as that of conventional printing, and will not exceed the requirements of the product outer packaging.

[0071] Furthermore, in order to effectively hide the identification code information, the present invention also prints the product identification code in the gap between the production date using transparent ink. Specifically, the inkjet printing device for the production date also includes a transparent dot matrix generation module.

[0072] Among them, the transparent dot matrix generation module is used to execute the steps: converting the product identification code into a corresponding binary expression, arranging the binary expression in the pattern dot matrix gap of the product's production date to be printed, and distributing the printing dot matrix corresponding to the digital "1" to the print head filled with transparent ink.

[0073] In this embodiment, the product identification code is converted according to the method of the above steps S11 to S14 to obtain the corresponding binary expression. Based on the pattern dot matrix of the product to be printed with the production date obtained in step S30, the above binary expression is arranged in the gaps of the pattern dot matrix. Fig. 9 , the pattern dot matrix of the product's production date to be printed can be placed in an n*m grid matrix, and each dot in the pattern dot matrix occupies one of the grids, so the n*m ​​grid matrix will have many blank grids. In this embodiment, the binary expression of the product identification code is arranged in the blank grids in sequence, and the arrangement order is not limited. For example, it can be arranged in the blank grids in order from top to bottom and from left to right.

[0074] In order to facilitate the splitting, in this embodiment, when arranging the binary expression of the product identification code, the position of the digital "1" is displayed as a gray dot, and the digital "0" is not displayed. Fig.10 After the arrangement is completed, the printing dot matrix composed of gray dots is distributed to the print head filled with transparent ink, as shown in Fig.11 That is, the print dot matrix corresponding to the digital "1" in the binary expression of the product identification code is printed in the gap between the production date and is invisible to the naked eye. It is understandable that the position of the digital "0" can also be displayed as a gray origin, and the digital "1" is not displayed, so that the print dot matrix of the digital "0" is distributed to the print head with transparent ink.

[0075] In this embodiment, the printing timing of the print head equipped with transparent ink can be calculated, so that it can be superimposed with the ink dots printed by multiple print heads that print the production date. The production date thus printed only shows the production date printed by inks of different colors, and the ink dots printed by transparent ink cannot be seen by the naked eye. When it is necessary to verify the sales location information, the production date on the item can be scanned by any scanning device in the prior art, and decoded according to the arrangement rules of the production date pattern dot matrix and the conversion rules of the identification hidden code, so as to obtain the pre-sale location information. It is also possible to further obtain the product identification code information hidden in the gap of the production date through a device that can identify transparent ink in the prior art, thereby ensuring the effectiveness of anti-counterfeiting.

[0076] Based on the same inventive concept, the present invention also provides a computer device, which may be a terminal device such as a server, a desktop computing device or a mobile computing device (e.g., a laptop computing device, a handheld computing device, a tablet computer, a netbook, etc.). The device includes one or more processors and a memory, wherein the processor is used to execute the inkjet printing-based anti-counterfeiting method of the program implementation method embodiment; and the memory is used to store a computer program executable by the processor.

[0077] Based on the same inventive concept, the present invention also provides a computer storage medium, corresponding to the aforementioned embodiment of the anti-counterfeiting method based on inkjet printing, and the computer storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the anti-counterfeiting method based on inkjet printing recorded in any of the aforementioned embodiments.

[0078] The present invention may take the form of a computer program product implemented on one or more storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code. Computer-usable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An inkjet printing method for production date, characterized in that: include: S10: converting the identification code of the product into an identification expression of a base other than decimal; S20: According to the correspondence between different numbers and colors, the numbers in the identification expression are replaced with dots of different colors to obtain an identification hidden code; S30: Arranging the hidden identification code into a pattern dot matrix of the production date to be printed on the product according to a preset rule; S40: splitting the pattern dot matrix according to colors to obtain multiple groups of printing dot matrixes of different colors; S50: Distributing the plurality of groups of printing dot arrays to the print heads of corresponding ink colors; Step S10 includes: S11: Split the product identification code into individual characters / words; S12: Obtain the hexadecimal representation of each character / word in the ASCII code comparison table; S13: converting the hexadecimal representation into a representation in a system other than decimal; S14: According to the combination order of the identification code, combine the representations of the characters / words in bases other than the decimal system to obtain identification expressions of the identification code in bases other than the decimal system.

2. The inkjet printing method of production date according to claim 1, characterized in that: In step S30, the identification hidden code is arranged into a pattern dot matrix of the production date to be printed on the product according to the stroke sequence of the production date to be printed.

3. The inkjet printing method of production date according to claim 1, characterized in that: Step S30 includes: S31: Obtaining the printing dot matrix of the production date to be printed on the product; S32: The topmost dot matrix in the first column of the printing dot matrix is ​​used as the first dot matrix, and is replaced with the identification hidden code in order from top to bottom and from left to right to obtain a pattern dot matrix of the production date to be printed on the product.

4. The inkjet printing method for production date according to any one of claims 1 to 3, characterized in that: Also includes: S60: converting the product identification code into a corresponding binary expression; According to a preset order, the binary expression is arranged in the gaps of the pattern dot matrix of the production date to be printed on the product; and the printing dot matrix corresponding to the digital "1" is distributed to the print head filled with transparent ink.

5. The inkjet printing method of production date according to claim 4, characterized in that: In step S60, the printing dot matrix corresponding to the digital number "0" is distributed to the print head filled with transparent ink.

6. An inkjet printing device for production date, characterized in that: include: An identification code conversion module, used to convert the identification code of the product into an identification expression of a base other than decimal; The implicit code conversion module is used to replace the numbers in the identification expression with dots of different colors according to the corresponding relationship between different numbers and colors to obtain the identification implicit code; A pattern dot matrix arrangement module, used to arrange the identification hidden code into a pattern dot matrix of the product's production date to be printed according to a preset rule; A printing dot matrix splitting module is used to split the pattern dot matrix according to color to obtain multiple groups of printing dot matrices of different colors; A printing dot matrix distribution module, used for distributing multiple groups of the printing dot matrix to the nozzles of corresponding colors; The identification code conversion module is also used to split the product's identification code into individual characters / words; obtain the hexadecimal representation of each character / word in the ASCII code comparison table; convert the hexadecimal representation into a representation in a base other than decimal; and combine the representations in bases other than decimal of each character / word in the combination order of the identification code to obtain an identification expression in a base other than decimal of the identification code.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer storage medium, characterized in that The method comprises a computer program, wherein when the computer program is executed by a controller, the computer program is used to implement the method according to any one of claims 1 to 5.

9. An inkjet printing system for production date, characterized in that: It comprises a plurality of print heads and an inkjet printing device for indicating the production date as described in claim 6; the plurality of print heads are arranged in sequence and in parallel above the production line along the production line direction, and the ink colors of the plurality of print heads are different; the inkjet printing device for indicating the production date is separately connected to the plurality of print heads.

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