Patent GB-1120923-A (GB)
Title: Continuous three-knife trimmer
IPC: B26D1/09
Filed: 1967-01-09
Abstract: 1,120,923. Book trimming machines. MIEHLE-GOSS-DEXTER Inc. 9 Jan., 1967 [10 March, 1966], No. 1178/67. Heading B4B. [Also in Division B8] In a machine for trimming the trailing and opposite side edges of a book 26, the book is initially fed into stacking mechanism 12, Figs. 1 and 2, and deposited upon a slotted work surface 28. Input feed mechanism 14 pushes the book through the front knife assembly 20, against a back stop (158), Fig. 11 (not shown), and on to a movable table 16 initially occupying the solid line position shown in Fig. 2. Immediately thereafter, movable transport clamp 18 is lowered to clamp the book on the table whereupon the knife assembly 20 trims thetrailing edge of the book. The back stop (158) is then lifted and the table 16 and clamp 18 are together moved rearwardly to their second position indicated by dotted outline 18<SP>1</SP> in Fig. 2, whereby the side edges of the book are trimmed by side knife assemblies 22. As the clamp 18 and knife assemblies 22 are moved to their inoperative positions, delivery mechanism 24 withdraws the book from the table 16 and on to a delivery table 30 consisting of a pair of conveyer belts. Stacking mechanism.-The stacking mechanism 12 comprises an enclosure (32), Figs. 3 and 4 (both not shown) including two pairs of opposite walls (34, 36 and 38, 40). The walls of one pair of opposite walls (34, 36) each comprise a plurality of endless belts (42) upon which are pivotally mounted a plurality of book supporting projecting fingers (44) which are automatioally movable, when struck by the armatures (52<SP>1</SP>) of electromagnets (50<SP>1</SP>), from a non- supporting position (44<SP>1</SP>) to a supporting position (44<SP>11</SP>) after a predetermined quantity of books have been stacked on the fingers therebelow. The bottom edges of the walls of the other pair of walls (38 40) are spaced above the work surface (28). Input feed mechanism.-The input feed mechanism 14 comprises a pusher 50 secured to a trolley 52 mounted on rollers 54, 56, Fig. 5. The trolley and pusher are movable from an initial starting position shown in solid lines, Fig. 5, to a finishing position indicated by dotted pusher 50<SP>11</SP> whereby the book is moved on to the movable work table 16. During their path of movement from starting to finishing position, the rollers 54, 56 are guided on a track 60. Between the front edge 64 of the work surfaoe 28 and the trailing edge of the table 16 is provided a bridge 68 which is pivotally secured to the edge 64, the bridge being movable between an upper position in which it bridges the gap between the surface 28 and the table 16 and a lower position 68<SP>1</SP> whereby the front knife assembly 20 trims the trailing edge of the book. As the bridge is rotated to its lower position, a switch arm 90 is moved upwardly and the under surface 92 of the arm causes the wheel 56 to be moved to a lower track 94 for the return movement of the trolley 52. The trolley is driven by the mechanism 58 comprising a cam 128, cam follower lever 124, bell-crank lever 108 and a linking arm 100 which is biased away from the trolley by a spring 102, a releasable catch 118 is provided between the levers 124, 108 which is arranged to slip if a book should be jammed. The lever 108 is movable to positions 108<SP>1</SP> and 108<SP>11</SP> and back again. The bias of spring 102 causes the trolley wheel 56 to be returned to the upper track 60 before the trolley returns to its initial position. Main clamp.-The clamp 18, Fig. 8, is guided within a bracket 182 movable with the table 16 and is moved between its upper and lower positions by mechanism comprising a cam 128 and a follower 186 which is adapted to pull down the cross-bar 193 of a bifurcated pull bar 192. The pull bar includes another cross-bar 195 which terminates in a clevis 194 which is pinned to a pivotally-mounted clamp operating lever 196 secured to the clamp by a roller 200 guided in a slot 204. The clamp is returned upwardly by springs 202. To accommodate books of varying thickness, the lever 186 is secured to the piston rod 208 of an air cylinder 206 connected by a restriction 212 to an air cylinder 214. This pneumatic means can be used to predetermine the clamping pressure developed by the clamp. Front knife assembly.-The front knife assembly 20 comprises a frame (62), Fig. 6 (not shown), within which is a clamp (96), a knife blade (98) and a T-shaped clamp (216). The clamp (96) is operated by mechanism comprising a cam (128), Fig. 7 (not shown), and cam follower (226) which causes movement of a pull bar (232). One end of the cam follower is connected to the piston rod (229) of an air cylinder (230) connected by a restriction (233) of an air cylinder (231). The knife blade (98) is operated by a pull rod (240) connected to the cam (128). On further rotation of the cam, the knife clamp and knife blade are returned to their original positions. As soon as the knife clamp is released, the table 16, book 26 and transportable clamp 18 are moved so that the side edges of the book can be cut. The table 16 is moved to its second position by a cam 242, Fig. 8 and follower 252 connected to the bracket 182. Side knife assemblies. The side knife assemblies 22 each comprise a clamp (258), Fig. 12 (not shown), which is actuated by a pull rod (266) operated by a cam follower (262) associated with a cam (260), and a knife blade (273) operable by a pull rod (276) connected to the cam (260). The follower (262) is connected at one end to the piston rod (278) of an air cylinder (280) connected by a restriction (283) to an air cylinder (281). Delivery mechanism.-The delivery mechanism 24 comprises a movable trolley 282, Fig. 13, having associated therewith a paddle 222 and a bracket 302 between which a book is positioned. The mechanism 24 is driven by mechanism 318 including a cam 242. The paddle is carried by an arm 292 which is maintained in its upper position by means of a pivotally-mounted spring-biased latch 340 which is released when it engages a runner 348, the paddle 222 and bracket 302 then falling to release the book which can then continue its rearward movement along the conveyer belts 30. The cams 128, 242 and 260 are driven in synchronism from a single motor (352), Fig. 14 (not shown).