Patent GB-264656-A (GB)
Title: Improvements in and relating to sheet-feeding and registering devices for printing presses
IPC: B65H9/00
Filed: 1926-01-19
Abstract: 264,656. White, M. L. Jan. 19, 1926. Sheet - registering devices ; sheetguides. - A sheet-feeding device for printing-machines such as those in which a gripper cylinder takes the sheets from movable front stops is constructed with improved means for registering the sheets against the front stops, and with means for rejecting sheets which are not accurately registered. As shown, the sheets are fed over a table 74, Fig. 4, and each edge of the sheet passes between guide members 62, 63, arranged in conjunction with the front stop 64, Fig. 5, all carried by a freely mounted arm 60 on a shaft 43 mounted above a skeleton gripper cylinder 15 which takes the registered sheets and passes them to a carrier moving between the printing and impression cylinders of the press. To each end of the shaft 43 is fixed by means of screws 48, to permit of adjustment, an actuating arm 47 fitted with extensions 49, 50 for engaging the arms 60 as the shaft 43 moves clockwise or anticlockwise. Before the sheets reach the stops 64 they are held between spring-pressed gripper members 55, Figs. 8 and 9, mounted in the arms 47, and rollers 65 mounted in the arms 60. The first clockwise motion of the arms 47 causes the sheet to be advanced by the rollers 65 and grippers 55, but, when the stop 64 is reached. the grippers 55 more relatively to the sheet until the extension 49 engage the arms 60 and move the parts 62, 63, 64, 55, 65 out of the way of grippers 15a on the feed cylinder 15, which grippers take the sheet as soon as it is registered against the stops 64. The pressure of the grippers 55 is obtained bv springs 58 which are adjustable so as to allow the pressure to be varied. The shaft 43 is oscillated from a cam 34 freely mounted on the shaft of the cylinder 15 and driven in the opposite direction thereto from the impression cylinder. This cam engages a roller 33 on a lever arm 31 connected by an adjustable rod 41 to a lever arm 42 on shaft 43. The extent of oscillation of the shaft 43 can be adjusted while the machine is running by adjusting an eccentric bearing 30 of the lever 31 by means of a screwed rod 25 which adjusts a lever arm 23 on the bearings. The arms 47 &c. can be adjusted laterally for dealing with sheets of different widths. The arms 47 also carry spring- pressed pivoted detector fingers 54 which normally engage under the sheets correctly presented to the front stops, and have no action on a central bevelled portion of the stop. If, however, a sheet is missing at either stop, the hooked end of the finger 54 engages the upper guide 62 and passes into engagement with the bevelled part of the stop 64. The arm 60 is thus moved earlier, and is given a greater movement than if a sheet is present. This greater movement enables a pin 68 to move to the position 68<a>, and thus by means of a slotted link 69 rotate a shaft 22 against the action of springs 75. Ejector fingers 73 are thus moved to the position shown in dotted lines in Fig. 4, and irregularly positioned sheets are discarded by the fingers 73.