Patent GB-190700125-A (GB)
Title: Improvements in Sheet-inverting Apparatus for Use in connection with Printing Machines.
Inventor: LOCK WILLIAM HENRY
Filed: 1907-01-02
Granted: 1907-10-24
Abstract: 125. Lock, W. H., and Parker, T. R. G. Jan. 2. Delivery apparatus. - Relates to a sheet reverser of the type described in Specification No. 13,940, A.D. 1906, but in which the sheet, with the first impression on top, is removed laterally from an upper delivery board, and passed to a lower one by cam-actuated grippers on a cylinder and also a second set on chains. The tapes for conveying the sheets to, and away from the turner are mounted on pulleys running on eccentrically-mounted spindles, by which the tapes are depressed into grooves in the tables when desired. The sheets are partly supported while being passed on to the lower board by a depressible sheet stop. The sheets are delivered by tapes 74, 75, Fig. 1, from a machine to the right-hand side of the Figure, to the switch 76, by which they are guided below the tapes 81, and above the tapes 75 to the lower feed-board 82, and to the next machine if for multi-colour work. If, however, the sheet is to be reversed for perfecting, the switch 76 is positioned, as shown, so as to guide the sheets upwards between tapes 74, 79 on to an upper board 80, and against a stop 180. The tapes 79 then drop into grooves in the board, through the movement of the eccentric bushes 100 of the tape-roller spindles, which is caused by levers 101, links 102, lever 107, &c. operated by a cam at the correct time. The sheet is then given a transverse movement by a roller 157, shown in Fig. 4, which is an elevation at right-angles to Fig. 1 ; this roller is driven through a belt 158, and has its surface just level with the top of the feed-board. At the right moment, a roller 156, actuated by levers from a cam 149, is lowered on to the roller 157, so that it can frictionally grip the sheet and pass it to grippers 140 on a cylinder 139. These are opened and closed by cams 141, 142 on a lever 146, spring- controlled, and operated by a cam 148 so that the cams 141, 142 are in position to open the grippers only at the correct time, as the cylinder 139 makes several revolutions for each sheet delivered and operation of the grippers each time would damage the sheet. The sheet is taken from the cylinder grippers 140 by grippers 164 on a shaft 162 carried by chains 160, which also carry a bar 163 between which and the grippers 164 the sheet is held ; it is next passed over the lower feed-board 82 in an inverted position, and falls, when released by the grippers, with what is then its back edge, against a sheet stop 168, which slides in a groove in the lower board 82 and is held in its upward position by a spring 169, except when depressed by cams 171 on the chains 160 to allow the grippers to pass. The grippers 164 are spring-controlled, and opened at the proper times by fixed cams. At this time, a roller 178 actuated by a cam presses the sheet against a continuously-revolving roller 179, in order to feed the sheet to the next machine. Simultaneously, the tapes 75, which run in grooves in the lower feed - board, are raised in a manner similar to that above described with reference to the tapes 79, and assist in carrying the sheet forward. In a modified form of apparatus, the sheets are passed round the cylinder 139 by switches or guides, instead of grippers, and are run on to a series of rods carried by the chains 160. These chains are given an intermittent motion, and when they are stationary, the tapes 75 are made to rise between the rods and carry the sheet forward. In this case, the tapes 75 only support the sheets between the chains 160, and extra tape runs are provided at each side. When the printing-machines are running independently, the sheets are not delivered to the tapes 74, 75, which are removed, ordinary delivery mechanism being substituted. The mechanism is preferably driven through chains from the impression-cylinder shaft of the machine to which the sheet is being passed, a clutch being interposed by which the mechanism may be rendered inoperative when not in use.