Patent GB-262606-A (GB)
Title: Sheet feeding mechanisms for platen printing presses
IPC: B41F1/28
Filed: 1925-12-24
Abstract: 262,606. Ackley, A., and Plum, S. H. Dec. 24, 1925. Sheet-carriers and forwarders; sheet-guides.- Sheet-feeding mechanism for a platen printing- press comprises a transfer table 66, Fig. 1, which receives each sheet 65 from the separating- devices and is lowered to deposit the sheet on the platen 6 when the latter is in sheet-receiving position, by adjustable mechanism mounted on the pile table 18. The sheets are separated from the pile 15 by suction nozzles 53a carried on arms 76 pivoted at 67 to a bracket 68 on the table 18, the arms being oscillated to carry the sheets towards the platen 6 by means of links 21, 90, 93, 101, Fig. 5, connected to the main driving-mechanism. After leaving the suction nozzles, the sheets fall on to the transfer table 66 and pass to the front stops 16 on the platen 6, being prevented from slipping over the stops by fingers 35 carried by the table 66. The table 66 is pivoted at 67 to the bracket 68 and with the fingers 35 is moved upwardly to permit the platen 6 to move to printing position as the arms 76 swing back to take a fresh sheet. The mechanism for this purpose comprises a cam 25 pivoted at 67 and adjustably secured to the table 66 by a bolt 26 and slot 27, the cam riding on a roller 31 carried by a lever 30 pivoted at 29 to the bracket 68 and operated from the lever 90 through a link 32. As the table 66 is raised, the fingers are also moved back relatively to it, being mounted on a link 39, Fig. 3, pivoted to levers 37, 41 themselves pivoted to the table 66. The lever 37 is connected by a link 43 to a member 50 slidably mounted on the table 66 by means of slots 51, 55 and pins 42, 67 respectively and the lever 41 is pivoted on the pin 42. A spring blade 54 tends to pull the member 50 into such a position that the fingers 35 are in their operative position, this position being determined by a screw 52 engaging an abutment 53 on the table 66. The fingers 35 are moved back as the table 66 moves back by the engaegment of a roller 56 on the member 50 with a fixed abutment 57 on the table 18. If access to the platen 6 is required, it is necessary to move the feeding- devices back over the pile table when the platen is in sheet-receiving position. For this purpose the link 21 can be disconnected from the oscillating lever 90, a hook part 74, Fig. 8, on the link engaging a bush 70 on the pivot pin 23, the bush having a pin 71 moving in a recess 72 in the lever 90 and a flat part 73 corresponding to a similar part 102 on the hook 74 to prevent the hook jumping off during normal working. The link 21 is lifted so as to be unhooked from the lever 90 by means of a pivoted member 80, Fig. 5, having a roller 97 adapted to bear against the underside of the link 21, when the member 80 is operated by a link 77 having a pin-and-slot connection 79 therewith and having a handle 76a, Fig. 3, attached to its shaft 75. To secure the table 66 in its out-of-use position over the table 18, a member 103 is pivoted to it at 104 and has a hook 105 which drops behind the pivot 67 when the table 66 :s pushed back, a pin 107 on the member 50 at the same time riding in a cam slot 106 on the member 103. The limit of the backward movement of the table 66 is fixed by the roller 56 on the member 50 engaging an inclined abutment 109 on the table 18. The hook 105 is released by a handle 108 on the member 103.