Patent GB-290019-A (GB)
Title: Improvements relating to the finishing of book covers
IPC: B42C7/00
Filed: 1927-04-11
Abstract: 290,019. Dunn, H. April 11, 1927. Gilding.-In a machine for laying gold or other metallic leaf upon the rounded back of a book clamped within a frame, the means carrying the gold leaf is mounted between two arms which are pivoted upon opposite sides of the frame and adapted to be rocked in an arcuate path over the book, the leaf being applied by a " laying-on " roller which rotates in contact with the back of the book and unwinds the leaf from a spool mounted above it. The book is clamped between a fixed plate 4, Fig. 2, and a screw-adjusted plate 5 disposed transversely between the sides 1 of the frame upon which arms 12, Fig. 1, are pivoted at their lower ends. Bars 13 connected between the upper ends of the arms 12 constitute handles for swinging them. The leaf-carrying devices are mounted between two transverse bridge-pieces 15, 16 secured to slides 14 on the arms 12, and tensile springs 75 provided with adjusting-screws 76 are secured between the slides 14 and lugs 77 on the arms 12 to pull the members 14, 16 downwardlv towards the back of the book, a limiting stop 79 being provided on each arm 12. The laying-on roller 52, Fig. 3, and a reel 50 of gold leaf are respectively supported upon sleeves 34, 33 mounted between two vertically-slidable plates which are movable within slots in two spaced plates 20, 24. The plate 24 is hinged at its upper end to a lug 23<1> at the upper end of the plate 20 and is swung outwardly to insert the roller 52 and reel 50 in position, being retained in its inner position by a pivoted catch engaging headed screws at the ends of two lugs 21 which project from the plate 20 and pass through apertures in the plate 24. Screw-threaded holes 22 are provided in one of the lugs 21 to receive screws which project through a longitudinal slot 17 in the bridge-piece 15 to secure the leaf carriers in position. The sliding plates carrying the roller 52 and reel 50 are adjusted vertically by means of screws 39 rotatably connected to a bridge 42 which is secured at one end to the plate sliding in the side plate 20, and at its other end is provided with! a pin 47 adapted to engage within a hole in the sliding plate carried by the side plate 24. Adjustable leaf springs 53, 55 engage the sides of the reel 50 and roller 52 to restrain their rotary movement. The back of the book is treated in known manner to cause the metallic leaf to adhere thereto, and, as the " laying-on " roller moves out of contact with the book the unwinding of the leaf ceases, whereupon further movement of the operating bar 13 severs the leaf on the back of the book from that on the roller. In order to position correctly the end of the leaf in readiness for its application to the next book, adjusting-means is provided, comprising a horizontal shaft 61, Fig. 8, mounted between brackets 60 on the transverse member 16 and carrying pulleys 62 connected by endless driving-bands 5 to pulleys 66 on the sleeves carrying the gold-leaf reels. Operating knobs 67 are provided at the ends of the shaft 61. In a modification, a coiled spring is connected to the leafcarrying sleeves, the unwinding of the leaf serving to coil up the spring until, the leaf being severed and the leaf-carriers subsequently lifted from the book, the end of the leaf is retracted into the required position by the tensioned spring. Alternatively, a lever may be mounted on the rotatable sleeve and connected to a spring which is tensioned bv the unwinding of the leaf. Specification 260,673, [Class 100 (ii), Printing Processes &c.], is referred to.