| 摘要 |
A method and apparatus for assembling a block for a double book or double book section in a 2-up coming and going method of bookmaking by providing a stream of groups of book elements each containing all the primary pages of the book or book section. The groups of the stream are conveyed along a rectilinear path towards a rotary turn-over member and alternate groups of the stream, which form a first series, are diverted from the path to pass around the turn-over member so as to be turned through 180 DEG about as axis parallel to the junction between the two pages on each leaf of group while the remaining groups, which form a second series are caused to continue along said path. The groups of the first and second series approach a combining station from opposite directions and are combined in pairs at the station. If the elements of the groups are uncollated, the elements are collated into half-block form before they reach the combining station and are then brought together in pairs at the combining station to form blocks, each block comprising a half-block of the first series and a half-block of the second series.
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