Patent Publication Number: US-2023150291-A1

Title: Printing system

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This is a Continuation of U.S. patent application Ser. No. 17/166,695 filed on Feb. 3, 2021, which claims the benefit of Japanese Patent Application No.2020-059762 filed on Mar. 30, 2020 including the specification, drawings and abstract are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a printing system, especially to a printing system that prints a plurality of elements constituting books, using different printing machines. 
     Description of Related Art 
     A book is constituted by a plurality of elements including a main section (hereinafter referred to as a book body), a cover, and the like. As for many books, the book bodies and the covers are printed on sheets of different kinds. Furthermore, laminate processing, scoring processing, or the like may be performed on the printed covers. Thus, in a typical printing system, the book bodies and the covers are printed using different printing machines. The book bodies and the covers are separately and sequentially output from the printing system. A bookbinding machine is provided in a later stage of the printing system. The bookbinding machine combines the book bodies and the covers to perform bookbinding. 
     As for bookbinding and shipping of the book, following methods are known. A first method is a method in which shipping is performed by hand. In this method, books after bookbinding are stored in a warehouse, and a worker gathers the books from the warehouse in accordance with an order, to perform shipping. A second method is a method in which the book bodies are printed digitally. In this method, printed covers are stored in the warehouse, and the book bodies are printed digitally in accordance with the order. The worker gathers the covers of the books from the warehouse in accordance with the order, and checks a book block (book body of one book) and the cover to insert them to a bookbinding machine. 
     A third method is a method in which an automatic warehouse is used. Also in this method, the printed covers are stored in the warehouse, and the book bodies are printed digitally in accordance with the order. Identification information (for example, barcode) of a job is printed on the book body. An automatic warehouse system reads the identification information printed on the book bodies, and takes out the covers automatically based on the read identification information. The book blocks and the covers are inserted to the bookbinding machine automatically. 
     Related to the invention of the present application, Japanese Laid-Open Patent Publication Hei 11-105455 discloses a bookbinding processing apparatus that reads, from a cover on which printing information including identification information is printed and a bundle of sheets including sheets on which printing information including the identification information is printed, the printing information printed on the cover and the bundle of sheets, and performs bookbinding process setting using the printing information read from the cover or the bundle of sheets, in order to prevent from performing bookbinding in a state where contents of the bundle of sheets and contents of the cover are different. 
     When performing bookbinding, it is necessary to insert the book bodies and the covers to the bookbinding machine with a correct correspondence. In conventional printing systems, performed is a method in which same books are printed repeatedly by the number of orders, in which it is not necessary to consider a bookbinding order. However, in recent years, printing of the books tends to be performed for many models in very small lots. Thus, it is necessary to insert the book bodies and the covers to the bookbinding machine with a correct correspondence, and this work becomes difficult. For example, there may be a case in which the worker restacks the covers in a reverse order before bookbinding. However, the restacking work is wasteful, and it may cause a bookbinding mistake. On the other hand, it takes a vast cost to store the covers of all books in the automatic warehouse. 
     SUMMARY OF THE INVENTION 
     Therefore, a purpose of the present invention is to provide a printing system that outputs a plurality of elements constituting books with a correct correspondence. 
     According to a first aspect of the present invention, there is provided a printing system that outputs first elements and second elements to a bookbinding machine performing bookbinding of books by combining the first elements and the second elements, the system including: a first printing section including a first printing machine configured to print the first elements, the first printing section configured to output the first elements sequentially; and a second printing section including a second printing machine configured to print the second elements, the second printing section configured to output the second elements sequentially, at least one of the first printing machine and the second printing machine is configured to receive printing order data indicating a printing order with regard to a plurality of jobs, and the at least one of the first printing machine and the second printing machine is configured to perform printing referring to the printing order data so that an inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with an inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section. 
     According to a second aspect of the present invention, in the first aspect of the present invention, the printing system further includes a print control apparatus configured to generate, as the printing order data, first printing order data indicating a printing order of the first elements and second printing order data indicating a printing order of the second elements, to output the first printing order data to the first printing machine, and to output the second printing order data to the second printing machine, the first printing machine is configured to print the first elements in the printing order indicated by the first printing order data, the second printing machine is configured to print the second elements in the printing order indicated by the second printing order data, and the print control apparatus is configured to generate the first printing order data and the second printing order data, so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section. 
     According to a third aspect of the present invention, in the first aspect of the present invention, the first printing machine is configured to generate the printing order data indicating the printing order at time of printing the first elements with regard to the plurality of jobs, and to output the printing order data to the second printing machine, and the second printing machine is configured to determine a printing order of the second elements based on the printing order data, so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section, and to print the second elements in the determined printing order. 
     According to a fourth aspect of the present invention, in the first aspect of the present invention, the second printing machine is configured to generate the printing order data indicating the printing order at time of printing the second elements with regard to the plurality of jobs, and to output the printing order data to the first printing machine, and the first printing machine is configured to determine a printing order of the first elements based on the printing order data, so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section, and to print the first elements in the determined printing order. 
     According to a fifth aspect of the present invention, in the first aspect of the present invention, the first printing machine is configured to generate the printing order data indicating the printing order of the second elements based on a printing order at time of printing the first elements with regard to the plurality of jobs, and to output the printing order data to the second printing machine, the second printing machine is configured to print the second elements in the printing order indicated by the printing order data, and the first printing machine is configured to generate the printing order data, so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section. 
     According to a sixth aspect of the present invention, in the first aspect of the present invention, the second printing machine is configured to generate the printing order data indicating the printing order of the first elements based on a printing order at time of printing the second elements with regard to the plurality of jobs, and to output the printing order data to the first printing machine, the first printing machine is configured to print the first elements in the printing order indicated by the printing order data, and the second printing machine is configured to generate the printing order data, so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section. 
     According to a seventh aspect of the present invention, in the first aspect of the present invention, the second printing section includes an order obtaining apparatus configured to obtain an overlapping order in unit of job of the second elements printed by the second printing machine, and to output data indicating the overlapping order as the printing order data to the first printing machine, and the first printing machine is configured to determine a printing order of the first elements based on the printing order data, so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section, and to print the first elements in the determined printing order. 
     According to an eighth aspect of the present invention, in the first aspect of the present invention, the first element is a book body, and the second element is a cover. 
     According to a ninth aspect of the present invention, in the first aspect of the present invention, the first printing machine is a continuous feed printing machine, and the second printing machine is a sheet fed printing machine. 
     According to a tenth aspect of the present invention, in the first aspect of the present invention, the second printing section further includes a processing apparatus configured to perform processing other than printing on the second elements printed by the second printing machine. 
     According to the first aspect, when the printing system performs printing with regard to the plurality of jobs, since the at least one of the first printing machine and the second printing machine performs printing referring to the printing order data, the inserting order in unit of job to the bookbinding machine of the first elements constituting the books can be made coincide with the inserting order in unit of job to the bookbinding machine of the second elements constituting the books, and a plurality of elements constituting the books can be output with a correct correspondence. Therefore, bookbinding can be performed correctly by combining the plurality of elements output from the printing system. 
     According to the second aspect, since the first printing machine and the second printing machine perform printing in the printing order indicated by the printing order data output from the print control apparatus, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the third aspect, since the second printing machine performs printing in the printing order determined based on the printing order data output from the first printing machine, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the fourth aspect, since the first printing machine performs printing in the printing order determined based on the printing order data output from the second printing machine, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the fifth aspect, since the second printing machine performs printing in the printing order indicated by the printing order data output from the first printing machine, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the sixth aspect, since the first printing machine performs printing in the printing order indicated by the printing order data output from the second printing machine, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the seventh aspect, since the first printing machine performs printing in the printing order determined based on the printing order data output from the order obtaining apparatus included in the second printing section, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the eighth aspect, the book bodies and the covers constituting the books can be output with a correct correspondence. Therefore, bookbinding can be performed correctly by combining the book bodies and the covers output from the printing system. 
     According to the ninth aspect, even when the first printing machine and the second printing machine are different in type, the plurality of elements constituting the books can be output with a correct correspondence. 
     According to the tenth aspect, even when the second printing section includes the processing apparatus, the plurality of elements constituting the books can be output with a correct correspondence. 
     These and other objects, features, modes, and effects of the present invention will be more apparent from the following detailed description with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a block diagram showing a configuration of a printing system according to a first embodiment of the present invention. 
         FIG.  2    is a diagram showing an example of an operation of the printing system shown in  FIG.  1   . 
         FIG.  3    is a block diagram showing a configuration of a printing system according to a second embodiment of the present invention. 
         FIG.  4    is a diagram showing an example of an operation of the printing system shown in  FIG.  3   . 
         FIG.  5    is a block diagram showing a configuration of a printing system according to a third embodiment of the present invention. 
         FIG.  6    is a block diagram showing a configuration of a printing system according to a fourth embodiment of the present invention. 
         FIG.  7    is a block diagram showing a configuration of a printing system according to a fifth embodiment of the present invention. 
         FIG.  8    is a block diagram showing a configuration of a printing system according to a sixth embodiment of the present invention. 
         FIG.  9    is a block diagram showing a configuration of a printing system according to a seventh embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     First Embodiment 
       FIG.  1    is a block diagram showing a configuration of a printing system according to a first embodiment of the present invention. A printing system  10  shown in  FIG.  1    includes a book body printing section  11 , a cover printing section  12 , and a print control apparatus  13 . The printing system  10  prints book bodies  1  and covers  2  constituting books, using different printing machines. The printing system  10  outputs the printed book bodies  1  and the printed covers  2  to a bookbinding machine  90 . In the bookbinding machine  90 , the book bodies  1  and the covers  2  are combined and subjected to bookbinding to form the books. The printing system  10  performs a plurality of printing jobs (hereinafter referred to as jobs) in accordance with an instruction provided externally. 
     The book body printing section  11  includes a book body printing machine  111 , a cutting machine  112 , a book body processing apparatus  113 , and a transfer apparatus  114 . The book body printing machine  111  prints the book bodies  1  of the books. The book body processing apparatus  113  performs processing on the printed book bodies  1 . The printed and processed book bodies  1  are sequentially output in unit of book block from the book body printing section  11 . The cover printing section  12  includes a cover printing machine  121 , transfer apparatuses  122 ,  124 , and a cover processing apparatus  123 . The cover printing machine  121  prints the covers  2  of the books. The cover processing apparatus  123  performs processing on the printed covers  2 . The printed and processed covers  2  are sequentially output from the cover printing section  12  one by one. 
     The bookbinding machine  90  having slots  91 ,  92  is provided in a later stage of the printing system  10 . The book bodies  1  in unit of book block output from the book body printing section  11  are sequentially inserted to the slot  91 . The covers  2  output from the cover printing section  12  are sequentially inserted to the slot  92  one by one. An inserting order in unit of job of the book bodies  1  to the bookbinding machine  90  is the same as an output order in unit of job of the book bodies  1  from the book body printing section  11 . An inserting order in unit of job of the covers  2  to the bookbinding machine  90  is the same as an output order in unit of job of the covers  2  from the cover printing section  12 . 
     The book body printing machine  111  is a continuous feed printing machine that performs continuous feed printing on a roll paper. The cutting machine  112  pulls out the printed roll paper from an outside, and cuts the pulled-out roll paper to obtain the book bodies  1  consisting of a plurality of sheets. The printed book bodies  1  are output from the cutting machine  112  in an overlapping state. The book body processing apparatus  113  takes out the cut book bodies  1  that are in the overlapping state sequentially from the top, performs processing such as bending processing, and outputs the book body  1  of one book in unit of book block (that is, book body  1  in unit of book block). The transfer apparatus  114  transfers the book bodies  1  in unit of book block to the slot  91  of the bookbinding machine  90  in a processing order. 
     When the book body printing machine  111  performs printing with regard to the plurality of jobs, in the printed roll paper, the book body  1  related to a job performed earlier is included in an inside portion of the roll paper, and the book body  1  related to a job performed later is included in an outside portion of the roll paper. Thus, in the book bodies  1  output from the cutting machine  112 , the former book body  1  is included in an upper portion of the overlap, and the latter book body  1  is included in a lower portion of the overlap. Therefore, the book bodies  1  are output from the cutting machine  112  in unit of job in an overlapping state from top to bottom in the printing order. The book body printing section  11  sequentially outputs the book bodies  1  in unit of job. 
     The cover printing machine  121  is a sheet fed printing machine that performs printing on sheets. The printed covers  2  are output from the cover printing machine  121  in an overlapping state. The transfer apparatus  122  makes bundles corresponding to an appropriate number of books based on the printed covers  2  in the overlapping state, and transfers the bundles to the cover processing apparatus  123  with keeping the overlapping state. The cover processing apparatus  123  performs processing other than printing (for example, laminate processing, scoring processing, or the like) on the printed covers  2 . The printed and processed covers  2  are output from the cover processing apparatus  123  one by one. The transfer apparatus  124  transfers the printed and processed covers  2  to the slot  92  one by one. 
     When the cover printing machine  121  performs printing with regard to the plurality of jobs, in the covers  2  output from the cover printing machine  121 , the cover  2  related to the job performed earlier is included in a lower portion of the overlap, and the cover  2  related to the job performed later is included in an upper portion of the overlap. Therefore, the covers  2  are output from the cover printing machine  121  in unit of job in an overlapping state from top to bottom in a reverse order of the printing order. The cover processing apparatus  123  outputs the covers  2  output from the cover printing machine  121  in the same order in the overlapping state, or outputs them in a reverse order in the overlapping state. The order in which the covers  2  are output is determined depending on a configuration, an operation status, or the like of the cover processing apparatus  123 . 
     The bookbinding machine  90  combines the book body  1  inserted to the slot  91  and the cover  2  correspondingly inserted to the slot  92  to perform bookbinding. In order to perform bookbinding correctly, it is required that an inserting order in unit of job to the slot  91  of the book bodies  1  coincide with an inserting order in unit of job to the slot  92  of the covers  2 . In other words, it is required that an inserting order (inserting order to slot  91 ) in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  11  coincide with an inserting order (inserting order to slot  92 ) in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  12 . However, unless any special devise is performed, the two orders may not coincide depending on configurations, operation statuses, or the like of the book body processing apparatus  113  or the cover processing apparatus  123 . 
     In order to solve the above-described problem, the printing system  10  includes the print control apparatus  13  that outputs printing order data. The printing order data are data indicating a printing order with regard to the plurality of jobs. Job data JD indicating the plurality of jobs that should be performed by the printing system  10  are input to the print control apparatus  13 . The print control apparatus  13  generates, as the printing order data, first printing order data PD 1  indicating a printing order of the book bodies  1  and second printing order data PD 2  indicating a printing order of the covers  2 , based on the job data JD, apparatus related information DD 11  of the book body printing section  11 , and apparatus related information DD 12  of the cover printing section  12  (details of these will be described later). The first printing order data PD 1  and the second printing order data PD 2  are determined, so that the inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  11  coincides with the inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  12 . 
     The print control apparatus  13  outputs the first printing order data PD 1  to the book body printing machine  111 , and outputs the second printing order data PD 2  to the cover printing machine  121 . The book body printing machine  111  receives the first printing order data PD 1  from the print control apparatus  13 , and prints the book bodies  1  in the printing order indicated by the first printing order data PD 1 . The cover printing machine  121  receives the second printing order data PD 2  from the print control apparatus  13 , and prints the covers  2  in the printing order indicated by the second printing order data PD 2 . Therefore, in the printing system  10 , the inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  11  coincides with the inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  12 . As a result, the bookbinding machine  90  can perform bookbinding correctly by combining the book bodies  1  and the covers  2 . 
       FIG.  2    is a diagram showing an example of an operation of the printing system  10 . A case where the printing system  10  performs four different jobs A to D is described here. It is assumed that each of the jobs A to D is a job for printing a book constituted by a book body and a cover, and the cover processing apparatus  123  outputs the covers output from the cover printing machine  121  in a processing order. Book bodies related to the jobs A to D are respectively referred to as A 1  to D 1 , covers related to the jobs A to D are respectively referred to as A 2  to D 2 , and books related to the jobs A to D are respectively referred to A 3  to D 3 . 
     Job data JD indicating the jobs A to D are input to the print control apparatus  13 . The print control apparatus  13  generates the first printing order data PD 1  indicating the printing order of the book bodies  1  and the second printing order data PD 2  indicating the printing order of the covers  2 , based on the job data JD, the apparatus related information DD 11  of the book body printing section  11 , and the apparatus related information DD 12  of the cover printing section  12 . The first printing order data PD 1  indicate that the book bodies A 1  to D 1  are to be printed in an order of D 1 , C 1 , B 1 , and A 1 . The second printing order data PD 2  indicate that the covers A 2  to D 2  are to be printed in an order of A 2 , B 2 , C 2 , and D 2 . 
     The print control apparatus  13  outputs the first printing order data PD 1  to the book body printing machine  111 . The book body printing machine  111  prints the book bodies A 1  to D 1  in the printing order indicated by the first printing order data PD 1 . The book bodies are output from the cutting machine  112  in unit of job in an overlapping state from top to bottom in the printing order. Thus, the book bodies A 1  to D 1  are output from the cutting machine  112  in the overlapping state from top to bottom in the order of D 1 , C 1 , B 1 , and A 1 . The book body processing apparatus  113  takes out the book bodies A 1  to D 1  in the order of D 1 , C 1 , B 1 , and A 1 , and outputs the book bodies  1  in unit of book block. The transfer apparatus  114  transfers the book bodies A 1  to D 1  in the order of D 1 , C 1 , B 1 , and A 1 . 
     The print control apparatus  13  outputs the second printing order data PD 2  to the cover printing machine  121 . The cover printing machine  121  prints the covers A 2  to D 2  in the printing order indicated by the second printing order data PD 2 . The covers are output from the cover printing machine  121  in unit of job in an overlapping state from top to bottom in a reverse order of the printing order. Thus, the covers A 2  to D 2  are output from the cover printing machine  121  in the overlapping state from top to bottom in an order of D 2 , C 2 , B 2 , and A 2 . The cover processing apparatus  123  outputs the covers A 2  to D 2  in the order of D 2 , C 2 , B 2 , and A 2 . The transfer apparatus  124  transfers the covers A 2  to D 2  in the order of D 2 , C 2 , B 2 , and A 2 . 
     The book bodies A 1  to D 1  are inserted to the slot  91  in the order of D 1 , C 1 , B 1 , and A 1 . The covers A 2  to D 2  are inserted to the slot  92  in the order of D 2 , C 2 , B 2 , and A 2 . At first, the bookbinding machine  90  combines the book body D 1  and the cover D 2  to perform bookbinding, and outputs the book D 3 . Next, the bookbinding machine  90  combines the book body C 1  and the cover C 2  to perform bookbinding, and outputs the book C 3 . Next, the bookbinding machine  90  combines the book body B 1  and the cover B 2  to perform bookbinding, and outputs the book B 3 . Next, the bookbinding machine  90  combines the book body A 1  and the cover A 2  to perform bookbinding, and outputs the book A 3 . The books A 3  to D 3  are output from the bookbinding machine  90  in an overlapping state from top to bottom in an order of A 3 , B 3 , C 3 , and D 3 . 
     The apparatus related information DD 11  of the book body printing section  11  will be described. As described above, the book body printing section  11  includes the book body printing machine  111 , the cutting machine  112 , the book body processing apparatus  113 , and the transfer apparatus  114 . The book body printing machine  111  and the cutting machine  112  output the book bodies A 1  to D 1  in the same order as the provided printing order in the overlapping state from top to bottom in the order of D 1 , C 1 , B 1 , and A 1 . The book body processing apparatus  113  processes the book bodies A 1  to D 1  in the above-described order, and the transfer apparatus  114  transfers the book bodies A 1  to D 1  in the above-described order. The apparatus related information DD 11  of the book body printing section  11  is information related to a group of apparatuses included in the book body printing section  11 , and includes information indicating a correspondence relation between a printing order of the jobs A to D in an apparatus (book body printing machine  111 ) positioned at a most upstream in the group of apparatuses and an output order of the book bodies A 1  to D 1  output from an apparatus (transfer apparatus  114 ) positioned at a most downstream in the group of apparatuses. 
     The apparatus related information DD 12  of the cover printing section  12  will be described. As described above, the cover printing section  12  includes the cover printing machine  121 , the transfer apparatuses  122 ,  124 , and the cover processing apparatus  123 . The cover printing machine  121  outputs the covers A 2  to D 2  in a reverse order of the provided printing order in the overlapping state from top to bottom in the order of D 2 , C 2 , B 2 , and A 2 . The transfer apparatus  122  and the cover processing apparatus  123  do not change the overlapping order of the covers A 2  to D 2 . The transfer apparatus  124  transfers the covers A 2  to D 2  in the order of D 2 , C 2 , B 2 , and A 2 . The apparatus related information DD 12  of the cover printing section  12  is information related to apparatuses included in the cover printing section  12 , and includes information indicating a correspondence relation between a printing order of the jobs A to D in an apparatus (cover printing machine  121 ) positioned at a most upstream in the group of apparatuses and an output order of the covers A 2  to D 2  output from an apparatus (transfer apparatus  124 ) positioned at a most downstream in the group of the apparatuses. 
     Note that although in the example shown in  FIG.  2   , each of the jobs A to D is a job for printing one book, each of the jobs A to D may be a job for printing a plurality of books. 
     As described above, the printing system  10  according to the present embodiment is a printing system that outputs first elements (book bodies  1 ) and second elements (covers  2 ) to the bookbinding machine  90  performing bookbinding of books by combining the first elements and the second elements, and includes a first printing section (book body printing section  11 ) including a first printing machine (book body printing machine  111 ) that prints the first elements and outputting the first elements sequentially, and a second printing section (cover printing section  12 ) including a second printing machine (cover printing machine  121 ) that prints the second elements and outputting the second elements sequentially. The first printing machine and the second printing machine receive printing order data (first printing order data PD 1  and second printing order data PD 2 ) indicating a printing order with regard to a plurality of jobs. The first printing machine and the second printing machine perform printing referring to the printing order data so that an inserting order (inserting order to slot  91 ) in unit of job to the bookbinding machine  90  of the first elements output from the first printing section coincides with an inserting order (inserting order to slot  92 ) in unit of job to the bookbinding machine  90  of the second elements output from the second printing section. 
     According to the printing system  10 , since the first printing machine and the second printing machine perform printing referring to the printing order indicated by the printing order data, the inserting order in unit of job to the bookbinding machine  90  of the first elements constituting the books can be made coincide with the inserting order in unit of job to the bookbinding machine  90  of the second elements constituting the books, and a plurality of elements (book bodies  1  and covers  2 ) constituting the books can be output with a correct correspondence. Therefore, the bookbinding machine  90  can perform bookbinding correctly by combining the plurality of elements constituting the books. 
     The printing system  10  further includes the print control apparatus  13  that generates, as the printing order data, the first printing order data PD 1  indicating a printing order of the first elements and the second printing order data PD 2  indicating a printing order of the second elements, outputs the first printing order data PD 1  to the first printing machine, and outputs the second printing order data PD 2  to the second printing machine. The first printing machine prints the first elements in the printing order indicated by the first printing order data PD 1 , and the second printing machine prints the second elements in the printing order indicated by the second printing order data PD 2 . The print control apparatus  13  generates the first printing order data PD 1  and the second printing order data PD 2 , so that the inserting order in unit of job to the bookbinding machine  90  of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine  90  of the second elements output from the second printing section. When generating the first printing order data PD 1  and the second printing order data PD 2 , the print control apparatus  13  refers to apparatus related information of the first printing section (apparatus related information DD 11 ) and apparatus related information of the second printing section (apparatus related information DD 12 ). Therefore, since the first printing machine and the second printing machine perform printing in the printing order indicated by the printing order data output from the print control apparatus  13 , the plurality of elements constituting the books can be output with a correct correspondence. 
     The first printing machine is a continuous feed printing machine, and the second printing machine is a sheet fed printing machine. Even when the first printing machine and the second printing machine are different in type, the plurality of elements constituting the books can be output with a correct correspondence. Furthermore, the second printing section further includes a processing apparatus (cover processing apparatus  123 ) that performs processing other than printing on the second elements printed by the second printing machine. Even when the second printing section includes the processing apparatus, the plurality of elements constituting the books can be output with a correct correspondence. 
     Second Embodiment 
       FIG.  3    is a block diagram showing a configuration of a printing system according to a second embodiment of the present invention. A printing system  20  shown in  FIG.  3    includes a book body printing section  21 , a cover printing section  22 , and a print control apparatus  23 . In the following embodiments, differences from the first embodiment will be described. Among components of each embodiment, those described in a formerly-described embodiment are provided with same reference numbers, and their descriptions are omitted. 
     The book body printing section  21  is obtained based on the book body printing section  11  according to the first embodiment by replacing the transfer apparatus  114  with a transfer apparatus  214 . Unlike the book body printing section  11 , the book body printing section  21  selectively outputs the book bodies  1  printed based on the plurality of different jobs to a plurality (here, two) of bookbinding machines  90 ,  95 . 
     The cover printing section  22  is obtained by adding, to the cover printing section  12  according to the first embodiment, a cover printing machine  221 , transfer apparatuses  222 ,  224 , and a cover processing apparatus  223 . The cover printing machine  221 , the transfer apparatus  222 , and the cover processing apparatus  223  operate in a manner similar to the cover printing machine  121 , the transfer apparatus  122 , and the cover processing apparatus  123 , respectively. Unlike the cover printing section  12 , the cover printing section  22  selectively outputs the covers  2  printed based on the plurality of different jobs to the plurality (here, two) of bookbinding machines  90 ,  95 . 
     In a later stage of the printing system  20 , the bookbinding machine  95  having slots  96 ,  97  is provided in addition to the bookbinding machine  90  having the slots  91 ,  92 . The book bodies  1  in unit of book block that are output from the book body printing section  21  are inserted to the slots  91 ,  96  sequentially. The covers  2  output from the cover printing section  22  are inserted to the slots  92 ,  97  one by one. 
     The transfer apparatus  214  transfers to the slot  91  a part of the book bodies  1  output from the book body processing apparatus  113  with keeping a receiving order, and transfers to the slot  96  the remaining part of the book bodies  1  output from the book body processing apparatus  113  with keeping the receiving order. The transfer apparatus  224  transfers to the slot  97  the covers  2  output from the cover processing apparatus  223 . 
     Job data JD indicating a plurality of jobs that should be performed by the printing system  20  are input to the print control apparatus  23 . The print control apparatus  23  generates, as the printing order data, the first printing order data PD 1  indicating the printing order of the book bodies  1 , the second printing order data PD 2  indicating the printing order of the covers  2  at the cover printing machine  121 , and third printing order data PD 3  indicating the printing order of the covers  2  at the cover printing machine  221 , based on the job data JD, apparatus related information DD 21  of the book body printing section  21 , and apparatus related information DD 22  of the cover printing section  22 . The first to third printing order data PD 1  to PD 3  are determined, so that inserting orders in unit of job to the bookbinding machines  90 ,  95  of the book bodies  1  coincide with inserting orders in unit of job to the bookbinding machines  90 ,  95  of the covers  2  for each group. 
     The print control apparatus  23  outputs the first printing order data PD 1  to the book body printing machine  111 , outputs the second printing order data PD 2  to the cover printing machine  121 , and outputs the third printing order data PD 3  to the cover printing machine  221 . The book body printing machine  111  receives the first printing order data PD 1  from the print control apparatus  23 , and prints the book bodies  1  in the printing order indicated by the first printing order data PD 1 . The cover printing machine  121  receives the second printing order data PD 2  from the print control apparatus  23 , and prints the covers  2  in the printing order indicated by the second printing order data PD 2 . The cover printing machine  221  receives the third printing order data PD 3  from the print control apparatus  23 , and prints the covers  2  in the printing order indicated by the third printing order data PD 3 . Therefore, in the printing system  20 , the inserting orders in unit of job of the book bodies  1  coincide with the inserting orders in unit of job of the covers  2 , in the bookbinding machines  90 ,  95 . 
       FIG.  4    is a diagram showing an example of an operation of the printing system  20 . As with the example shown in  FIG.  2   , a case where the printing system  20  performs the jobs A to D will be described. In the printing system  20 , the covers A 2 , B 2  are printed by the cover printing machine  121 , and the covers C 2 , D 2  are printed by the cover printing machine  221 . 
     The job data JD indicating the jobs A to D are input to the print control apparatus  23 . The job data JD according to the present embodiment include information indicating the book bodies  1  and the covers  2  that are printed based on the job should be subjected to bookbinding in any of the bookbinding machines  90 ,  95 . The print control apparatus  23  generates the first printing order data PD 1  indicating the printing order of the book bodies  1 , the second printing order data PD 2  indicating the printing order of the covers  2  at the cover printing machine  121 , and the third printing order data PD 3  indicating the printing order of the covers  2  at the cover printing machine  221 , based on the job data JD, the apparatus related information DD 21  of the book body printing section  21 , and the apparatus related information DD 22  of the cover printing section  22 . The first printing order data PD 1  indicate that the book bodies A 1  to D 1  are to be printed in an order of B 1 , A 1 , D 1 , and C 1 . The second printing order data PD 2  indicate that the covers A 2 , B 2  are to be printed in an order of A 2  and B 2 . The third printing order data PD 3  indicate that the covers C 2 , D 2  are to be printed in an order of C 2  and D 2 . 
     The print control apparatus  23  outputs the first printing order data PD 1  to the book body printing machine  111 . The book body printing machine  111  prints the book bodies A 1  to D 1  in the printing order indicated by the first printing order data PD 1 . The book bodies A 1  to D 1  are output from the cutting machine  112  in an overlapping state from top to bottom in the order of B 1 , A 1 , D 1 , and C 1 . 
     The print control apparatus  23  outputs the second printing order data PD 2  to the cover printing machine  121 . The cover printing machine  121  prints the covers A 2 , B 2  in the printing order indicated by the second printing order data PD 2 . The covers A 2 , B 2  are output from the cover printing machine  121  in an overlapping state from top to bottom in an order of B 2  and A 2 . The covers A 2 , B 2  are output from the cover processing apparatus  123  and the cover printing section  22  in the order of B 2  and A 2 . 
     The print control apparatus  23  outputs the third printing order data PD 3  to the cover printing machine  221 . The cover printing machine  221  prints the covers C 2 , D 2  in the printing order indicated by the third printing order data PD 3 . The covers C 2 , D 2  are output from the cover printing machine  221  in an overlapping state from top to bottom in an order of D 2  and C 2 . The covers C 2 , D 2  are output from the cover processing apparatus  223  and the cover printing section  22  in the order of D 2  and C 2 . 
     Among the book bodies A 1  to D 1 , the book bodies A 1 , B 1  respectively correspond to the covers A 2 , B 2  printed by the cover printing machine  121 , and the book bodies C 1 , D 1  respectively correspond to the covers C 2 , D 2  printed by the cover printing machine  221 . The transfer apparatus  214  transfers the book bodies A 1 , B 1  to the slot  91 , and transfers the book bodies C 1 , D 1  to the slot  96 . 
     The book bodies A 1 , B 1  are inserted to the slot  91  in an order of B 1  and A 1 . The covers A 2 , B 2  are inserted to the slot  92  in the order of B 2  and A 2 . At first, the bookbinding machine  90  combines the book body B 1  and the cover B 2  to perform bookbinding, and outputs the book B 3 . Next, the bookbinding machine  90  combines the book body A 1  and the cover A 2  to perform bookbinding, and outputs the book A 3 . The books A 3 , B 3  are output from the bookbinding machine  90  in an overlapping state from top to bottom in an order of A 3  and B 3 . 
     The book bodies C 1 , D 1  are inserted to the slot  96  in an order of D 1  and C 1 . The covers C 2 , D 2  are inserted to the slot  97  in the order of D 2  and C 2 . At first, the bookbinding machine  95  combines the book body D 1  and the cover D 2  to perform bookbinding, and outputs the book D 3 . Next, the bookbinding machine  95  combines the book body C 1  and the cover C 2  to perform bookbinding, and outputs the book C 3 . The books C 3 , D 3  are output from the bookbinding machine  95  in an overlapping state from top to bottom in an order of C 3  and D 3 . 
     According to the printing system  20  according to the present embodiment, as with the first embodiment, since the first printing machine (book body printing machine  111 ) and the second printing machine (cover printing machines  121 ,  221 ) perform printing in the printing order indicated by the printing order data (first to third printing order data PD 1  to PD 3 ) output from the print control apparatus  23 , the inserting order in unit of job to the bookbinding machine  90  of the book bodies A 1 , B 1  output from the book body printing section  21  can be made coincide with the inserting order in unit of job to the bookbinding machine  90  of the covers A 2 , B 2  output from the cover printing section  22 , and bookbinding can be performed correctly by the bookbinding machine  90 . Furthermore, the inserting order in unit of job to the bookbinding machine  95  of the book bodies C 1 , D 1  output from the book body printing section  21  can be made coincide with the inserting order in unit of job to the bookbinding machine  95  of the covers C 2 , D 2  output from the cover printing section  22 , and bookbinding can be performed correctly by the bookbinding machine  95 . 
     Third Embodiment 
       FIG.  5    is a block diagram showing a configuration of a printing system according to a third embodiment of the present invention. A printing system  30  shown in  FIG.  5    includes a book body printing section  31  and a cover printing section  32 . The book body printing section  31  is obtained based on the book body printing section  11  according to the first embodiment by replacing the book body printing machine  111  with a book body printing machine  311 . The cover printing section  32  is obtained based on the cover printing section  12  according to the first embodiment by replacing the cover printing machine  121  with a cover printing machine  321 . 
     The book body printing machine  311  is obtained by adding, to the book body printing machine  111 , a function of outputting printing order data PD 4 . The book body printing machine  311  generates the printing order data PD 4  indicating a printing order at time of printing the book bodies  1  with regard to a plurality of jobs, and outputs the printing order data PD 4  to the cover printing machine  321 . 
     The cover printing machine  321  is obtained by adding, to the cover printing machine  121 , a function of determining a printing order of the covers  2  based on the received printing order data PD 4 . The cover printing machine  321  receives the printing order data PD 4  from the book body printing machine  311 , determines the printing order of the covers  2  based on the printing order data PD 4 , apparatus related information DD 31  of the book body printing section  31 , and apparatus related information DD 32  of the cover printing section  32 , and prints the covers  2  in the determined printing order. The cover printing machine  321  determines the printing order of the covers  2 , so that an inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  31  coincides with an inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  32 . 
     As described above, in the printing system  30  according to the present embodiment, the first printing machine (book body printing machine  311 ) generates the printing order data PD 4  indicating a printing order at time of printing the first elements (book bodies  1 ) with regard to the plurality of jobs, and outputs the printing order data PD 4  to the second printing machine (cover printing machine  321 ). The second printing machine determines the printing order of the second elements based on the printing order data PD 4 , so that the inserting order in unit of job to the bookbinding machine  90  of the first elements output from the first printing section (book body printing section  31 ) coincides with the inserting order in unit of job to the bookbinding machine  90  of the second elements (covers  2 ) output from the second printing section (cover printing section  32 ), and prints the second elements in the determined printing order. When determining the printing order of the second elements, the second printing machine refers to the printing order data PD 4 , the apparatus related information of the first printing section (apparatus related information DD 31 ), and the apparatus related information of the second printing section (apparatus related information DD 32 ). 
     According to the printing system  30 , since the second printing machine performs printing in the printing order determined based on the printing order data PD 4  output from the first printing machine, the plurality of elements (book bodies  1  and covers  2 ) constituting the books can be output to the bookbinding machine  90  with a correct correspondence. 
     Fourth Embodiment 
       FIG.  6    is a block diagram showing a configuration of a printing system according to a fourth embodiment of the present invention. A printing system  40  shown in  FIG.  6    includes a book body printing section  41  and a cover printing section  42 . The book body printing section  41  is obtained based on the book body printing section  11  according to the first embodiment by replacing the book body printing machine  111  with a book body printing machine  411 . The cover printing section  42  is obtained based on the cover printing section  12  according to the first embodiment by replacing the cover printing machine  121  with a cover printing machine  421 . 
     The cover printing machine  421  is obtained by adding, to the cover printing machine  121 , a function of outputting printing order data PD 5 . The cover printing machine  421  generates the printing order data PD 5  indicating a printing order at time of printing the covers  2  with regard to a plurality of jobs, and outputs the printing order data PD 5  to the book body printing machine  411 . 
     The book body printing machine  411  is obtained by adding, to the book body printing machine  111 , a function of determining a printing order of the book bodies  1  based on the received printing order data PD 5 . The book body printing machine  411  receives the printing order data PD 5  from the cover printing machine  421 , determines the printing order of the book bodies  1  based on the printing order data PD 5 , apparatus related information DD 41  of the book body printing section  41 , and apparatus related information DD 42  of the cover printing section  42 , and prints the book bodies  1  in the determined printing order. The book body printing machine  411  determines the printing order of the book bodies  1 , so that an inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  41  coincides with an inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  42 . 
     As described above, in the printing system  40  according to the present embodiment, the second printing machine (cover printing machine  421 ) generates the printing order data PD 5  indicating a printing order at time of printing the second elements (covers  2 ) with regard to the plurality of jobs, and outputs the printing order data PD 5  to the first printing machine (book body printing machine  411 ). The first printing machine determines the printing order of the first elements based on the printing order data PD 5 , so that the inserting order in unit of job to the bookbinding machine  90  of the first elements (book bodies  1 ) output from the first printing section (book body printing section  41 ) coincides with the inserting order in unit of job to the bookbinding machine  90  of the second elements output from the second printing section (cover printing section  42 ), and prints the first elements in the determined printing order. When determining the printing order of the first elements, the first printing machine refers to the printing order data PD 5 , the apparatus related information of the first printing section (apparatus related information DD 41 ), and the apparatus related information of the second printing section (apparatus related information DD 42 ). 
     According to the printing system  40 , since the first printing machine performs printing in the printing order determined based on the printing order data PD 5  output from the second printing machine, the plurality of elements (book bodies  1  and covers  2 ) constituting the books can be output to the bookbinding machine  90  with a correct correspondence. 
     Fifth Embodiment 
       FIG.  7    is a block diagram showing a configuration of a printing system according to a fifth embodiment of the present invention. A printing system  50  shown in  FIG.  7    includes a book body printing section  51  and the cover printing section  12 . The book body printing section  51  is obtained based on the book body printing section  11  according to the first embodiment by replacing the book body printing machine  111  with a book body printing machine  511 . 
     The book body printing machine  511  is obtained by adding, to the book body printing machine  111 , a function of outputting printing order data PD 6 . The book body printing machine  511  generates the printing order data PD 6  indicating a printing order of the covers  2 , based on a printing order at time of printing the book bodies  1  with regard to a plurality of jobs, apparatus related information DD 51  of the book body printing section  51 , and the apparatus related information DD 12  of the cover printing section  12 , and outputs the printing order data PD 6  to the cover printing machine  121 . 
     The cover printing machine  121  receives the printing order data PD 6  from the book body printing machine  511 , and prints the covers  2  in the printing order indicated by the printing order data PD 6 . The book body printing machine  511  determines the printing order of the covers  2 , so that an inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  51  coincides with the inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  12 . 
     As described above, in the printing system  50  according to the present embodiment, the first printing machine (book body printing machine  511 ) generates the printing order data PD 6  indicating the printing order of the second elements (cover  2 ) based on the printing order at time of printing the first elements (book bodies  1 ) with regard to the plurality of jobs, and outputs the printing order data PD 6  to the second printing machine (cover printing machine  121 ). The second printing machine prints the second elements in the printing order indicated by the printing order data PD 6 . The first printing machine generates the printing order data PD 6 , so that the inserting order in unit of job to the bookbinding machine  90  of the first elements output from the first printing section (book body printing section  51 ) coincides with the inserting order in unit of job to the bookbinding machine  90  of the second elements output from the second printing section (cover printing section  12 ). When generating the printing order data PD 6 , the first printing machine refers to the printing order of the first elements, the apparatus related information of the first printing section (apparatus related information DD 51 ), and the apparatus related information of the second printing section (apparatus related information DD 12 ). 
     According to the printing system  50 , since the second printing machine performs printing in the printing order indicated by the printing order data PD 6  output from the first printing machine, the plurality of elements (book bodies  1  and covers  2 ) constituting the books can be output to the bookbinding machine  90  with a correct correspondence. 
     Sixth Embodiment 
       FIG.  8    is a block diagram showing a configuration of a printing system according to a sixth embodiment of the present invention. A printing system  60  shown in  FIG.  8    includes the book body printing section  11  and a cover printing section  62 . The cover printing section  62  is obtained based on the cover printing section  12  according to the first embodiment by replacing the cover printing machine  121  with a cover printing machine  621 . 
     The cover printing machine  621  is obtained by adding, to the cover printing machine  121 , a function of outputting printing order data PD 7 . The cover printing machine  621  generates the printing order data PD 7  indicating a printing order of the book bodies  1 , based on a printing order at time of printing the covers  2  with regard to a plurality of jobs, the apparatus related information DD 11  of the book body printing section  11 , and apparatus related information DD 62  of the cover printing section  62 , and outputs the printing order data PD 7  to the book body printing machine  111 . 
     The book body printing machine  111  receives the printing order data PD 7  from the cover printing machine  621 , and prints the book bodies  1  in the printing order indicated by the printing order data PD 7 . The cover printing machine  621  determines the printing order of the book bodies  1 , so that the inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  11  coincides with an inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  62 . 
     As described above, in the printing system  60  according to the present embodiment, the second printing machine (cover printing machine  621 ) generates the printing order data PD 7  indicating the printing order of the first elements (book bodies  1 ) based on the printing order at time of printing the second elements (covers  2 ) with regard to the plurality of jobs, and outputs the printing order data PD 7  to the first printing machine (book body printing machine  111 ). The first printing machine prints the first elements in the printing order indicated by the printing order data PD 7 . The second printing machine generates the printing order data PD 7 , so that the inserting order in unit of job to the bookbinding machine  90  of the first elements output from the first printing section (book body printing section  11 ) coincides with the inserting order in unit of job to the bookbinding machine  90  of the second elements output from the second printing section (cover printing section  62 ). When generating the printing order data PD 7 , the second printing machine refers to the printing order of the second elements, the apparatus related information of the first printing section (apparatus related information DD 11 ), and the apparatus related information of the second printing section (apparatus related information DD 62 ). 
     According to the printing system  60 , since the first printing machine performs printing in the printing order indicated by the printing order data PD 7  output from the second printing machine, the plurality of elements (book bodies  1  and covers  2 ) constituting the books can be output to the bookbinding machine  90  with a correct correspondence. 
     Seventh Embodiment 
       FIG.  9    is a block diagram showing a configuration of a printing system according to a seventh embodiment of the present invention. A printing system  70  shown in  FIG.  9    includes a book body printing section  71  and a cover printing section  72 . The book body printing section  71  is obtained based on the book body printing section  11  according to the first embodiment by replacing the book body printing machine  111  with a book body printing machine  711 . The cover printing section  72  is obtained based on the cover printing section  12  according to the first embodiment by replacing the cover printing machine  121  and the transfer apparatus  124  with a cover printing machine  721  and a transfer apparatus  724 , respectively. 
     When printing the covers  2 , the cover printing machine  721  prints barcodes on the covers  2  as job identification information. The transfer apparatus  724  includes a sheet stacker  725  that stacks the printed covers  2 , and a barcode reading apparatus  726 . The barcode reading apparatus  726  is attached to the sheet stacker  725 , and reads the barcodes printed on the covers  2  to be stacked in the sheet stacker  725 . 
     The sheet stacker  725  obtains an overlapping order in unit of job of the covers  2  output from the cover processing apparatus  123  (that is, the covers  2  printed by the cover printing machine  721 ), based on the barcodes read by the barcode reading apparatus  726 . The sheet stacker  725  outputs data indicating the obtained overlapping order to the book body printing machine  711  as printing order data PD 8 . 
     The book body printing machine  711  receives the printing order data PD 8  from the sheet stacker  725 , determines a printing order of the book bodies  1  based on the printing order data PD 8  and apparatus related information DD 71  of the book body printing section  71 , and prints the book bodies  1  in the determined order. The book body printing machine  711  determines the printing order of the book bodies  1 , so that an inserting order in unit of job to the bookbinding machine  90  of the book bodies  1  output from the book body printing section  71  coincides with an inserting order in unit of job to the bookbinding machine  90  of the covers  2  output from the cover printing section  72 . Note that when determining the printing order of the book bodies  1 , the book body printing machine  711  may refer to apparatus related information DD 72  (not shown) of the cover printing section  72 , in addition to the printing order data PD 8  and the apparatus related information DD 71  of the book body printing section  71 . 
     As described above, in the printing system  70  according to the present embodiment, the second printing section (cover printing section  72 ) further includes an order obtaining apparatus (sheet stacker  725  having barcode reading apparatus  726 ) that obtains an overlapping order in unit of job of the second elements (covers  2 ) printed by the second printing machine (cover printing machine  721 ), and outputs data indicating the obtained overlapping order to the first printing machine (book body printing machine  711 ) as the printing order data PD 8 . The first printing machine determines the printing order of the first elements based on the printing order data PD 8 , so that the inserting order in unit of job to the bookbinding machine  90  of the first elements (book bodies  1 ) output from the first printing section (book body printing section  71 ) coincides with the inserting order in unit of job to the bookbinding machine  90  of the second elements output from the second printing section (cover printing section  72 ), and prints the first elements in the determined printing order. When determining the printing order of the first elements, the first printing machine refers to the printing order data PD 8  and the apparatus related information of the first printing section (apparatus related information DD 71 ). At this time, the first printing machine may refer to the apparatus related information of the second printing section (apparatus related information DD 72 ). 
     According to the printing system  70 , since the first printing machine performs printing in the printing order determined based on the printing order data PD 8  output from the order obtaining apparatus included in the second printing section, the plurality of elements (book bodies  1  and covers  2 ) constituting the books can be output with a correct correspondence. 
     Note that in  FIG.  9   , the sheet stacker  725  having the barcode reading apparatus  726  is provided in the transfer apparatus  724  existing in a later stage of the cover processing apparatus  123 . In place of this, an order obtaining apparatus such as a sheet stacker having a barcode reading apparatus may be provided at an arbitrary position later than the cover printing machine  721 . Furthermore, information other than the barcode may be used as the job identification information. 
     In the printing systems  10 ,  20  according to the first and second embodiments, the first printing machine and the second printing machine perform printing in the printing order indicated by the received printing order data. In the printing system  30  according to the third embodiment, the second printing machine performs printing in the printing order determined based on the received printing order data. In the printing systems  40 ,  70  according to the fourth and seventh embodiments, the first printing machine performs printing in the printing order determined based on the received printing order data. In the printing system  50  according to the fifth embodiment, the second printing machine performs printing in the printing order indicated by the received printing order data. In the printing system  60  according to the sixth embodiment, the first printing machine performs printing in the printing order indicated by the received printing order data. In the printing systems according to the embodiments of the present invention, at least one of the first printing machine and the second printing machine receives the printing order data, and the at least one of the first printing machine and the second printing machine performs printing referring to the printing order data so that the inserting order in unit of job to the bookbinding machine of the first elements output from the first printing section coincides with the inserting order in unit of job to the bookbinding machine of the second elements output from the second printing section. 
     As for the above-described printing systems according to each embodiment, a variety of modification examples can be configured. For example, although in the above description, the second element constituting the book is the cover, the second element may be an element other than the cover (for example, a page on which a picture is color-printed, or the like). The number of the book body printing machine(s) included in the book body printing section is arbitrary, and the number of the cover printing machine(s) included in the cover printing section is also arbitrary. The cover printing section may include a plurality of processing apparatuses of different kinds. The book body printing section may include another apparatus, and the cover printing section may also include another apparatus. 
     Furthermore, in each of the above-described embodiments, the book bodies  1  in unit of book block are inserted to the slot  91  of the bookbinding machine  90  one by one, and the covers  2  are inserted to the slot  92  of the bookbinding machine  90  one by one. In place of this, the book bodies  1  of a plurality of book blocks may be inserted to the slot  91  in an overlapping state, or a plurality of covers  2  may be inserted to the slot  92  in an overlapping state. Furthermore, in each of the above-described embodiments, the transfer apparatus provided in a later stage of the cover processing apparatuses  123 ,  223  transfers the covers  2  one by one. In place of this, a transfer apparatus provided in the later stage of the cover processing apparatuses  123 ,  223  may transfer a plurality of covers  2  in an overlapping state. 
     Although the present invention is described in detail in the above, the above description is exemplary in all of the aspects and is not restrictive. It is understood that various other changes and modification can be derived without going out of the present invention. 
     This application claims a priority based on Japanese Patent Application No. 2020-59762 filed on Mar. 30, 2020, and entitled “Printing System”, which is incorporated herein by reference in its entirety.