US1374305A - Art of bookbinding - Google Patents

Description

0. LUTOLF. ART OF BOOKBINDINQ." APPLICATION FILED JAN. z]. I920.

Patented Apr. 12, 1921.

UNITED STATES PATENT OFFICE.

o'r'ro Ln'roLr, or sr. GALLEN, SWITZERLAND, ASSIGNOR T0 JOHANNA microns-BILL, or s'r. GALLEN, SWITZERLAND.

ART OF BOOKBINDING.

Specification of Letters Patent. i Patented A 12 1921 Application filed January 27, 1920. Serial No. 354,395.

To all to 7mm it may concern:

Be it known that I, Or'ro Lii'roLF, a citizen of the Swiss Confederation, and residing at St. Gallen, Switzerland, have invented certain new and useful Improvements in the Art of Bookbinding, of which the following is a specification.

The present invention has reference to certain new and useful improvements in the bookbinding art, and it relates more particularly to an improved method of attaching the gathered sheets or signatures of a book by means of wire staples to the cross-tapes which are to be aflixed to the cover flaps in well known manner, and the object of the invention is to improve on the wirestitching as now conventionally practised by so inserting, bending and driving-in the wire staples that their free shank ends are countersunk or anchored, as it were, into the cross-tape and the fold of thesheets, for the purpose of affording the staples a firm purchase on the tape which prevents relative displacement, and for preventing the staples from opening up again, the shank points in this latter instance readily giving rise to injuries to the smoothing hand ofv the operator.

My invention will best be understood when described in connection with the accompanying drawing, in which Figure 1 represents a perspective view of a plurality of signatures wirestitched by my improved method to a cross-tape; Figs. 25 show sections through a number of folded sheets with the wire staple in. its successive operative stages; Figs. 6l0 show similar views when using asomewhat longer staple.

Referring first to Figs. 1-5, the reference numeral 2 denotes the wire staples, 3

the gathered sheets or signatures, and 5 the back tape. Each staple 2, which comprises the bridge portion and the two rectangularly extending shanks 1, is driven by special machinery through the fold of the sheets 3 from within the latter outwardly so that the shanks 1. protrude through the fold edge (Fig. 2); next the extreme free ends of the shanks are bent inwardly to form short prongs 4 (Fig. the cross-tape 5 is then inserted between the shanks, the latter are folded over down onto the fold of the sheets (Fig. l) and are finally forced down flat in parallelism with the staple bridge, the lnbent prongs & entering the clenched tape 5 (Fig. 5). The staple ends thus are securely anchored in the tape, preventing relative lateral displacement of the parts and they are not liable to spread again to interfere with the ensuing manipulations.

In order to clenchingly secure the staples to sheets and tape their shanks may be made somewhat longer (Fig. 6) and their extremities l are bent off to a reater extent and at a slightly acute angle *ig. 7) the crosstape 5 is inserted (Fig. 8), the staple ends 4: are driven home through tape 5 and sheets 3 (Fig. 9) and they are finally rolled inwardly and clenched (Fig. 10) by contacting with, and sliding away from each other on, the staple bridge.

All these operations are carried out mechanically by a special machine which forms phe subject matter of a separate applicaion.

What I claim is 1. The herein described method of wirest1tching sheets or signatures to cross-tapes, which consists in driving the staple, which comprises a bridge portion and two rectangularly extending shanks, through the fold of the sheets or signatures from within outwardly, inbending the free extremities of the shanks, insertlng the cross-tape between the shanks, and bending inwardly the shanks down flat onto the cross-tape, forcing therelpy said inbent shank extremities into the ape.

2. The herein described method of wire- .stitching sheets or signatures to the crosstapes, which consists in driving the staple, which comprises a bridge portion and two rectangularly extending shanks, through the fold of the sheets or signatures from within outwardly, sharply inbending the free extremities of the staple shanks at a slightly acute angle and their inbent portion being longer than the combined thickness of cross tape and sheets, inserting the cross-tape between the shanks, bending down the shanks onto the tape, forcing thereby the said inbent shank extremities through the tape and underlying sheets and causing them to be clenchingly deflected by the staple bridge.

OTTO LllTOLF.

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