JPS6245079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel even-number bookbinding method using imposition.

As is well known, in order to bind printed materials, the printed books are sequentially folded to form signatures (including rotary printing machine folding), and these signatures are stacked one on top of the other in a predetermined order. Then, after so-called collation, all the signatures are stitched together to complete the bookbinding. Each printed book is a large sheet of paper on which many pages of the book are printed at once on both sides. In even-number bookbinding, the same page is printed in an even number of places on the same printed book, and the folded sheets formed from this printed book are divided into separate books during bookbinding.

To make it easier to understand, the conventional method of even-numbered bookbinding will be explained using an example in which the printed book is only 16 pages and folded in two. The front and back sides of the printed book A1 are shown, respectively. In the case of this printed book, the signatures are constructed so that 8 sheets of paper, or 16 pages, are obtained from one printed book, and the numbers on the front and back of the printed book are the page numbers (page numbers). For convenience, the printed content corresponding to the page number is indicated by the page number). After the predetermined printing is completed, the printed book A1 is folded in half along the fold line 1 with the front surface facing outward as shown in FIG. Next, as shown in Figure 4, fold line 2
Then, as shown in FIG. 5, the sheet is further folded in half along fold line 3.

On the other hand, the second-fold printed book A2 whose front and back sides are shown in FIGS. 6 and 7, respectively, has the same structure as the first-fold printed book A1, and has fold lines 1, 2, It is equipped with However, the printed content, that is, the printed page is different from the printed page of the first fold book A1, and is a continuation of the printed page. This second-fold printed book A2 is also sequentially folded in half in the same manner as described for the first-fold printed book A1, and is brought into the state shown in FIG. 8, which is the same as FIG. 5. The printed books A1 and A2 shown in FIGS. 5 and 8 are in the state of signatures.

The two signatures A1 and A obtained in this way
2 (Hereinafter, the reference numbers in the printed book will be used as they are)
In the case of flat binding or perfect binding, the sheets are superimposed in a predetermined order as shown in FIG. This work is called collation. Note that in the case of saddle stitching, the method of collation is slightly different, but the same concept as described below can be applied. In the case of conventional two-page bookbinding, two of the same pages are arranged side by side in each of the folded sheets A1 and A2 that have been collated in this way. In addition, in the case of 4-copy binding, four of the same pages are lined up.
Note that although the illustrated example is horizontal two-page binding, the same applies to vertical two-page binding. In the conventional bookbinding method, the arrangement of pages on the printed books A1 and A2, that is, the imposition, is performed as follows. Signature A1, A
When 2 are collated as shown in Figure 9, there are 16 in total.
The sheets S1, S2, S3, ...S15, S16 will overlap, and these sheets will have the lowest page number "1" from the frontmost sheet S1 to the last sheet S16. Pages are allocated so that the page numbers increase continuously in the order of front, back, front, and back of the sheet up to the maximum page number "32". This state is schematically shown in FIG. 10, in which only the odd-numbered pages are visible because only the front side of each sheet is visible. As mentioned above, the same pages are arranged on the same side of the same sheet of paper. One of these two side-by-side pages will be referred to as a "section" in the following explanation.

In the conventional imposition as described above, the allocation or arrangement of pages in printed books A1 and A2 in the developed state must be as shown in FIGS. 1, 2, 6, and 7. However, this type of imposition has the following problems.

Since the printed book A1 and the printed book A2 have different printed contents, and the printed contents on the front and back sides of each printed book are also different, twice as many printing plates as the number of printed books are required. Furthermore, in the case of two-page bookbinding, for example, the same printing content for the same page must be placed side by side on the same printing plate, which requires more effort.

The present invention provides an excellent imposition bookbinding method that can reduce the number of printing plates in the conventional method by half and solves the problems of the conventional method.

Embodiments of the present invention will be described below with reference to FIG. 11 and subsequent figures. This example is an example of horizontal 2-page bookbinding, and the contents of the printed book are 16 pages 2 pages as in the above case.
It was an occasion.

The basic principle of the present invention is as shown in FIG. This FIG. 11 is a schematic diagram corresponding to FIG. 10 showing a known example, but in the present invention, the first fold signature B
1 and 2 fold B2 are collated in the same manner as shown in FIG. 10, 16 sheets S1, S2,...S
16, one of the sections, that is, the section shown on the left side, shows the front and back sides of the sheets from the frontmost sheet S1 to the last sheet S16, from the minimum page number "1" to the maximum page number "32". , the front page, the back page, and the pages are allocated so that the page numbers increase successively in the order of front and back pages, and in the other section of the sheet, that is, the section shown on the right side, from the front sheet S1 to the rear sheet S16. From the maximum page number "32" to the minimum page number "1", the front of the paper sheet,
Pages are allocated so that the page numbers decrease successively in the order of back, front, and back.

By the way, if the pages are allocated in this way, the two signatures B1 and B2 will be exactly the same. This fact is shown in FIG. 11 at the midpoint between both signatures, namely sheet S8 and sheet S9.
If we look at both signatures B1, B2 with respect to the midpoint on the line joining the center points of the , we can immediately see that all the pages are symmetrical with respect to the midpoint. Therefore, the two signatures B1, B2
However, according to the present invention, it is only necessary to produce two copies of the same signature, that is, a printed book. In other words, it is sufficient to produce the same number of printing plates as the number of folds, which is half of the number of printing plates in the above-mentioned known example. Therefore, the same printed book or signature B1, B2 will be designated by the reference numeral B and will be described below.

Figures 12 and 13 show the front and back sides of printed book B, respectively. The impositions on the front and back sides of this printed book B are as shown in these figures. This printed book B is folded along folding lines 1, 2, and 3 similar to those already explained for the known example in FIGS. 14 and 1.
By folding in the order shown in FIGS. 5 and 16, signature B in FIG. 16 is obtained.

After producing two identical signatures B and B according to the above procedure, when collating them, if they are stacked in the same direction, the arrangement shown in FIG. 11 cannot be obtained. That is, in the present invention, two identical signatures B, B are collated in opposite directions, that is, back to back. The state is as shown in FIG. 17, where the fold line 2 of the front signature B is on the left side, while the fold line 2 of the back signature B is on the right side. The sheets S1, S2, . . . S8 are equivalent to the sheets S16, S15, . . . S9, respectively.

In the embodiment described above, there are two signatures, but even if there are more signatures, bookbinding can be performed using the same principle. For example, if four signatures are used, the front and rearmost signatures will be the same, and the two middle signatures will be the same. In any case, the number of signatures is even, and the page numbers of adjacent sections are reversed. This arrangement does not change regardless of whether the collation mode is flat binding, perfect binding, or saddle stitching.

Incidentally, front attachments or back attachments other than ordinary leaf pages, such as frontispieces, may be pasted on the paper sheets at required locations before the final binding process. In addition, when an odd number of folds and a number of stamp leaf pages smaller than the total number of sheets in each fold are required, odd number folds and stamp leaf pages are inserted between two symmetrically adjacent folds. All you have to do is bind it.

Between the completion of collation and the completion of bookbinding, adjacent sections are divided into two equal groups of sheets, which constitute two books.

As can be seen from the above description of the embodiments, according to the present invention, the number of types of books to be printed can be reduced to half compared to the case where the conventional imposition even number binding method is used. This means that the number of print editions can be cut in half. Since the number of printing plates is reduced by half, the number of times printing plates are replaced in the printing machine is also halved, and the amount of printing with the same printing plate is doubled compared to the conventional case. Therefore, in addition to cost savings due to a reduction in the number of printing plates, the present invention has significant effects such as improving the operating efficiency of the printing press and shortening the start-up schedule. An imposition method that aims to reduce the number of printing plates by half is ``hanshagake'' (commonly called donden), but in this imposition method, one side is printed first, and then the other side is printed. While sometimes it is necessary to reverse the orientation of the paper and also to cut the paper after printing, the method of the present invention allows signatures to be formed and collated immediately after printing. Furthermore, although conventional two-coat binding could not be carried out due to printing disadvantages, by proceeding with the two-coat binding of the present invention, the printing disadvantages are eliminated and the advantages of two-coat binding can be obtained. This will be understood without any explanation.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the front side of a printed book with conventional imposition, Figure 2 is a diagram showing the back side, and Figures 3 to 5 are the folding order of the printed book shown in Figures 1 and 2. FIG. 6 is a diagram showing the front side of another printed book with conventional imposition, FIG. 7 is a diagram showing the back side, and FIG.
FIG. 9 is a perspective view showing the state of collation of two signatures; FIG. FIG. 11 is a schematic diagram showing the arrangement of the paper sheets of the signature in the case of the present invention; FIG. 12 is a diagram showing the front side of the printed book in the case of the present invention; FIG. 13 is also a diagram showing the back side. Figures 14 to 16 are
FIGS. 12 and 13 are perspective views sequentially showing the folding order of printed books, and FIG. 17 is a perspective view showing the state of collation in the case of the present invention. A1, A2... conventional printed book, B1, B2, B...
Printed books in the case of the present invention, S1, S2, S3,...S
16...Paper leaf, 1, 2, 3...Fold line.

Claims (1)

[Claims] 1. When a signature is formed by sequentially folding each of a plurality of printed books, and all the signatures of all the printed books are sequentially stacked and collated, all the sheets of the collated signatures are In one section, the page number increases continuously from the lowest to the highest number from the first sheet to the last sheet, and for all other sheets of the signature, from the first sheet to the last sheet. Each printed book is impositioned and printed so that the page numbers decrease continuously from the highest number to the lowest number toward the sheets of paper, and signatures are formed from these printed books and collated. An imposition even-number bookbinding method, which involves cutting the book into the sections described above during binding to create an even-number of books.