History of the Government Printing Office, at Washington, D. C., with a Brief Record of the Public Printing, 1789-1881

Overview

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...BOOK FOLDING MACHINE. Folding Machines. Figs. 5 and 6 give a correct view of these machines. To understand their operation, it must be borne in mind that each sheet of the kind upon which this book is printed is doubled at the middle, that this doubled sheet is next folded through its center, and that this ...
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Overview

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...BOOK FOLDING MACHINE. Folding Machines. Figs. 5 and 6 give a correct view of these machines. To understand their operation, it must be borne in mind that each sheet of the kind upon which this book is printed is doubled at the middle, that this doubled sheet is next folded through its center, and that this doubly-folded sheet is again doubled together. There are thus three folds to each sheet, and each of these must be exactly in its right place, or the whole book will be irregular in shape. Externally the Folding Machine presents the appearance of a table, the lid divided at the center into two parts. The operator lays the sheet upon the table in such a way that two small pointers pass through two holes in the sheet. These holes were made by two steel pointers in the press when the sheet was printed. These point holes serve as guides in several cases, which we have not thought necessary to enumerate. The elevated knife, which appears in the illustration, now comes down on the sheet over the line of the first fold, and forces it between two rollers, which compress the doubling. This completes the first fold. A second and third knife and pair of rollers, hidden under the cover of the machine, make the second and third folds in the same manner; and the triply-folded sheet is dropped into a receptacle at the bottom of the machine. This is the work of the machine for folding an octavo sheet. The folding and pasting machines used in the Government Printing Office on speeches, etc., in addition to folding the sheets as described above, also paste the leaves together at the back, thus saving the expense of stitching, and producing, at one operation and handling of the sheet, a neatly-bound pamphlet ready for trimming and distribution. There are twenty-one octavo a...
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Product Details

  • ISBN-13: 9781150747366
  • Publisher: General Books LLC
  • Publication date: 5/28/2012
  • Pages: 74
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.15 (d)

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