JPS606494A - Method of finishing double signature bookbinding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a means for preventing cracks in the back of a book that occur from the chain portion toward the other cutting line to extend to the other cutting line when one of the parallel cutting lines in a two-book binding is cut. The purpose of this method is to make effective use of the desired effect of two-coat binding.

Conventionally, two-copy bookbinding allows two books to be bound at once, which is advantageous in terms of productivity and cost compared to normal bookbinding. This has the disadvantage that when cutting one of the two, cracks that occur in the back often extend to the back beyond the other cutting line. These cracks not only significantly reduce the commercial value of the book, but also sometimes result in the book being defective, and have been a factor that has hindered the use of two-book binding, which has the advantageous aspects mentioned above. Therefore, it was impossible to use thick books.

In this invention, prior to the final cutting of the parallel cutting lines, a notch is cut into the back of the book between the cutting lines, thereby
This method prevents cracks in the back of the book that occur from the chain section to the other cutting line when cutting one cutting line from extending to the other cutting line, and is an extremely easy method to achieve the desired effect of two-book binding. This is a second method that allows it to be used effectively.

Next, the details of this finishing method will be explained based on drawings which are examples.

In the figure, (1) is a two-sheet binding before final cutting using this finishing method, with a parallel cutting line (2) that crosses the center.
, (2) A notch (4) of a required depth is formed in the book back (3) in the direction of the edge (5) by cutting means using an electric saw. Note that the parallel cutting lines (2), (2) are shown as dotted lines in the drawing for convenience of explanation, but their positions are determined using a positioning device attached to the cutting machine at the time of final cutting.

This invention uses parallel cutting lines (2) as described above.

(2) A notch (4) is formed in the book back (3) between the two, and then finishing cutting is performed.The function and effect of this notch (4) will be described below.

As shown in Figure 2, parallel cutting lines (2), (2)
When cutting one side of the book, the book on the side fixed with the presser plate (7) will not crack (9) even if the cutting blade (8) descends, but the book on the side fixed with the presser plate (7) will not crack (9). As the cutting blade (8) descends, the book on the side without the book is compressed downward and sideways and becomes distorted. At this time, the parts of the paper surface that are not fixed with the adhesive are cut one by one while being shifted, so that the distortion can be absorbed. On the other hand, the back of the book (
3) cannot absorb this strain and cracks due to the strain stress. In conventional two-blade bookbinding in which the notch (4) is not provided in this area, the cutting blade (8)
As it descends, this crack (9) increases and spreads in the direction of the cutting line. However, in this invention, the notch (4) is formed on the way where the generated crack (9) spreads.
Since it is recessed, the cracks (9) that occur as shown in the bottom of Figure 2 are interrupted and disappear in the space of this notch (4), and the strain stress of the book spine (3) caused by the cutting blade (8) is reduced. is also absorbed in this space. Therefore, no new cracks (9) will occur in the book spine (3) beyond the notch (4).

As explained above, the present invention solves the problem of cracks (9) that hindered the use of two-coat bookbinding by extremely easy means, and makes it possible to effectively utilize the desired effect of two-copy bookbinding. Thick books that were previously impossible 2
This invention has also made it possible to bind books in a single sheet, and the implementation of this invention has extremely large industrial effects such as improved product quality, improved productivity, and reduced costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a two-sheet book before final cutting according to the present invention. FIG. 2 is a sectional view showing this cutting state. FIG. 3 is a reference diagram showing the state of cutting in conventional two-copy binding. 1... Two-sheet binding according to the present invention 2 Cutting line 3... Spine of book 4... Notch 5... Fore edge of book 6... Title of book 7... Holding plate 8...・Cutting blade 9...Crack 1o...Surface plate 11...Conventional two-cutter bookbinding patent applicant Nichiho Sogo Binding Co., Ltd.) Ji11 Figure 2nd Figure 3

Claims (1)

[Claims] Parallel cutting lines (2) that cross the center, prior to finishing cutting of (2), a notch (4) is cut in the book spine (3) between the cutting lines (2), (2). A finishing method for two-coat binding.