Booklet making method and apparatus

A booklet making method comprising:

• cutting a web of paper having a plurality of booklet page sections on each of widthwise one and other sides of the web of paper, into a first and a second continuous sheet of paper on said widthwise one and other sides, wherein each of the plurality of booklet page sections are spaced apart from one another in a transport direction of the web of paper;
• laying the first and second continuous sheets of paper one on the other, and forming a double set continuous sheet of paper by bonding widthwise one side edges of a pair of overlapping such booklet page sections together with a throwaway paste only on said one side edges of said pair of overlapping such booklet page sections and bonding widthwise other side edges of a next adjacent pair of such overlapping booklet page sections together with a setting paste only on said other side edges of said next adjacent pair of such overlapping booklet page sections;
• cutting said double set continuous sheet of paper into split double sheets comprising pairs of sheets having such pairs of overlapping booklet page sections;
• laying said split double sheets one on another and binding adjacent sheets thereof together for an odd number of such sheets at said widthwise other side edge with an integrating paste, to form a group of such odd numbers of sheets so bound together, thereby forming a booklet-like product comprising such groups piled one on another;
• and
• cutting off a widthwise one side edge of said booklet-like product, thereby separating portions of said split double sheets which are bonded with said throwaway paste to form a plurality of booklets which comprise sheets of said page sections.

A booklet making apparatus which comprises:

• first cutting means for cutting a web of paper, which has a plurality of booklet page sections on each of widthwise one and other sides of the web of paper, into a first and a second continuous sheet of paper on said widthwise one and other sides, wherein each of the plurality of booklet page sections are spaced apart from one another in a transport direction of the web of paper,
• side edge truing-up means for truing up the first and second continuous sheets of paper to bring them into coincidence with each other in side edge,
• pasting means for pasting,
• superposing means for laying the first and second continuous sheets of paper one on top of another to form a double set continuous sheet of paper,
• second cutting means for cutting the double set continuous sheet of paper into a plurality of split double sheets,
• piling means for laying the split double sheets one on top of another and causing them to be bonded together to form a booklet-like product, and
• trimming means for cutting off unnecessary portions of the booklet-like product to form a plurality of booklets therefrom,
• wherein said pasting means comprises:
• a double sheet setting pasting means for pasting a first plurality of booklet page sections from among the plurality of booklet page sections of the first continuous sheet of paper with a setting paste only on widthwise other side edge portions of the first plurality of booklet page sections of the first continuous sheet of paper,
• a throwaway pasting means for pasting a second plurality of booklet page sections, which are other than the first plurality of booklet page sections, which are from among the plurality of booklet page sections of the first continuous sheet of paper and which are arranged alternately with the first plurality of booklet page sections in the transport direction of the web of paper, with a throwaway paste only on widthwise one side edges of the second plurality of booklet page sections of the first continuous sheet of paper, and
• an integrating pasting means for pasting widthwise other side edge portions of the second continuous sheet of paper with an integrating paste, and
• wherein said trimming means is adapted to cut off portions of the booklet-like product which are pasted and bonded with the throwaway paste.