Practical Bookbinding. Paul AdamЧитать онлайн книгу.
which is very frequently done in the printery, but seldom in the bindery: this is the so-called gathering before folding. This work, as we have already mentioned, is done so that printed matter for publication can be properly stored or prepared for sending away.
The sheets are taken just as they left the press and piled up side by side in a row in order of number on a long table, each pile of sheets in exactly the same position as the others and just as they would be placed for folding; that is to say, for 8vos the first signature at the bottom left-hand side underneath, the second signature being at the bottom right-hand side on the top.
Generally the work is gathered in batches of 5-6 sheets. The sheets in question are then laid out (see Fig. 5).
The worker takes a board the required size, upon which he places the sheets when gathered; he begins at No. 1 pile, takes off the top sheet, being very careful not to take two, lays it upon the board, and so he goes the length of the table, taking the top sheet from each pile. He lays the pile of gathered sheets on the end of the table or another table standing behind. They are there received by another worker, knocked up, and folded in the middle. If only one worker can be spared for the job, the gathered sections are placed to one side, but each is laid crosswise over the other so that they are easily picked up afterwards for knocking up and folding. If the work has more than five or six sections, the separately gathered sections must be afterwards again gathered in the same manner. Perhaps there may be placed in the last section parts of a sheet—the title, addenda, corrigenda, frontispiece, diagrams, &c. The treatment of these will be dealt with presently (pp. 22-24).
Sheets so gathered must be afterwards opened out for folding in the bindery. The section is opened, the crease well pressed out, and the whole smoothed down quite flat, care being taken that all sheets lie the same way, the opened sections lying side by side according to the signatures.
Before the folded sheets are arranged or gathered, there is frequently still some pasting to be done. The title, for instance, is seldom printed with the first sheet, but is usually made up with the preface, contents, &c., after printing the last page, often as part of the last sheet.
On this account the last sheet must be examined before folding to see how it is composed. If it happens that the sheet is to be exactly halved, it is best to cut the sheet in the middle and fold each half separately. It is even worth while cutting the sheet into quarters if the sheets can be pinned on, because it is then possible to fold the cut sheets in lots of five or six and to draw out each one singly, as it is commonly called "pulling out."
This pulling out is very easy work; each folded batch is separately opened in the middle, fanned out with a paper folder so that each sheet stands back about 1/2-1 cm. behind the other, and the batch folded together again; it would then appear as in Fig. 6.
Fig. 6—Sections fanned out for drawing out.
Take the batch lightly between the finger and the thumb of the left hand, and with the right draw off the sheets from the top one by one, knock them up, and firmly press down the back fold.
Every part of a sheet which after folding makes less than four pages (equal to two leaves) must be pasted on. To do this the parts to be pasted are fanned out from the back with the pasting side uppermost, that is to say, the sheets are fanned out with the folder in the same way as described for "pulling out," until they lie like steps or stairs, each sheet displaying an edge of about 3 mm. In this manner all sheets so lie upon each other that each is about 3 mm. behind the one under it.
The narrow margin is pasted; to avoid pasting more than the proper margin of the top sheet, a piece of waste paper should be laid on top at the right distance from the edge. Each leaf has thus a narrow pasted edge by which it is secured to the main sheet. So that the pasted edges do not stick together whilst each sheet is being fixed in its place, which, of course, takes time, the batch is taken between the fingers immediately after pasting, and by a few light movements the sheets are worked a little further apart.
Fig. 7—Sections fanned out for pasting.
Take the batch at A between the finger and thumb of the right hand, at B in the same way with the left; the upper leaves slip gently backwards if the right hand bends the batch lightly upwards so that the sheets are pushed to B, the left first allows the sheets to slip back and then holds them firmly so that the right may repeat this movement several times.
The batch is then so placed across the table that it lies to the right of the worker with the pasted edge away from him, whilst the pile of sheets to which the parts are to be pasted lies to the left, also with the back edge away from him. Leaf after leaf is taken up, carefully adjusted to back and upper fold, and pasted on to the main section and lightly rubbed down to right and left with the finger-tips, putting aside to the left each sheet as finished.
Under certain conditions, the pasting on of a so-called correction may be a very disagreeable task. If errors have been made in composing or printing a page which escaped notice and correction at the proper time, a revised page is printed, and this must be inserted by the binder in the place of the faulty one. This inserting is done after the folding; the faulty leaf is so cut off that a narrow margin is left in the back to which the rectified leaf is pasted.
If maps or plans accompany the work these also must be inserted; thin sheets need simply be pasted on the back edge like other sheets and fixed in their right place; but thick paper is not easily pasted on and, besides, would always pull away the next leaf. It is therefore joined to a narrow strip of paper about 1 cm. in width and this is pasted and fixed in the back. If several plates have to be inserted at the same place, or to be fixed at the end of the book, they are joined together in sections of suitable thickness. For this, thin paper is hinged in the back of the book, that is, the two plates are pasted over each other after pasting a narrow margin of about 3 mm. When dry, the double leaf so obtained is folded together in the middle of the pasted little guard. As this process lessens the leaf which has the back-fold by as much as is pasted to the other, the latter is cut down by 3 mm. beforehand.
If there are many such plates to be joined together, they are made up in sections of 4 or 6 according to the thickness of the paper, and every 2 or 3 cut down according to circumstances, and the same number left the full size. When all have been properly cut, the edges are fanned out and pasted. Then as many as make up a section are taken up and fanned out a little further, the pasted edge of No. 1 is laid on 6, 2 on 5, 3 on 4, and the batch set aside on the left and the same process gone through with the next lot. When dry, the plates thus guarded together are creased together at the back.
Plates on thick paper must likewise be mounted on strips of paper. These are cut from thin, strong note-paper and are so arranged that their thickness in the back is the same as the thickness of the plates. It is well to select a paper which when double is as thick as the plates. In case the plates are extra thick, the guard is made four-fold. The width of the guard must be measured to correspond. If a guard of double thickness only is required for filling up, it is cut twice the width of the guard and 3 mm. added for pasting on the plate. This gives 2 × 1 cm. + 3 mm. = 23 mm. If a guard of four-fold thickness is necessary, the result is 4 × 1 cm. + 3 mm. = 43 mm. The plates are fanned out narrowly with the back edge uppermost, pasted, and each plate affixed to one of the made guards. This work is called "mounting on guards."
When the pasted plates are dry they are folded in the back on the following plan according to whether the guard must be two-fold or three-fold.
