Patent GB-582102-A (GB)
Title: Improvements in sheet delivery mechanism for stop-cylinder printing machines
IPC: B65H29/56
Filed: 1944-08-03
Abstract: 582,102. Sheet-delivery apparatus. LAKEMAN (PRINTING MACHINERY & APPLIANCES.), Ltd., A. H., LAWSON, W. G., and JENKINS, F. S. Aug. 3, 1944, Nos. 14856/44 and 7761/45. [Class 100 (i)] Sheet-delivery apparatus for a stop-cylinder printing-machine comprises suction devices for engaging the tail end of a printed sheet on the impression cylinder and for initiating the removal of the sheet from the cylinder, and a gripper-conveyer for receiving the sheet from the suction-devices and for conveying it to the delivery pile. The suction devices consist of hollow rubber-tipped nozzles 22, Figs. 3 and 4, fitted to a hollow tube 5 oscillatable in bearings 6, 7 on a lever 8, free to pivot about a stub-shaft 31 coaxial with the impression cylinder 2. A spring 19 retracts the lever 8 against a fixed stop 191 adjusted according to the length of the sheets so that with the lever against the stop, lowering of the nozzles 22 causes them to engage the tail end of the sheet on the cylinder 2 when the latter is at rest. To oscillate the lever 8 in order to convey the sheet to grippers 67, 68 on a conveyer 65, Fig. 1, a lever 17 free on the shaft 3<1> and adapted to abut against and move the lever 8 away from the stop 191 against the action of the spring 19 is oscillated from a cam 10 through a lever 14 and link 16. The cam 10 is adjustable on its shaft 11 so as to cause the lever 17 to engage the lever 8 at the correct time according to the length of sheet. Oscillation of the tube 5 to raise and lower the nozzles 22 is controlled by two arms 50, 151 fixed to the tube. A spring 54 acting on the arm 50 tends to raise the nozzles 22. A cam 56 adjustable by a bolt-and-slot connection 58 on a gear 57 driven from the shaft 11 of the cam 10 engages a roller 55 on the arm 151 at the requisite time to lower the nozzles into engagement with the tail end of the sheet. Another roller 60 on the arm 151 engages a fixed but adjustable cam 61 to ensure that the nozzles are correctly positioned as they approach the grippers 67, 68. Control of the suction to the nozzles is by means of a slide valve 33 mounted on the lever 8. An arm 37 fixed to the tube 5 engages a roller 35 on the valve as the tube is turned by the cam 56 so that suction is applied from a tube 32 to the tube 5. When the nozzles approach the grippers, a fixed stop 38, Fig. 1, is engaged by a second roller 36 on the valve to close the valve. At the same time, a pivoted spring-closed valve 39 is opened to put the tube into communication with the atmosphere, by a fixed stop 49 engaging a roller 48 thereon. Each gripper comprises a series of fingers 67 fixed to a gripper-bar 66 on the conveyer and a series of fingers 68 fixed to a bar 69 pivoted to brackets on the bar 66. Other fingers fixed to the bars 66, 69 are pressed apart by springs to close the grippers which are opened to receive a sheet from the nozzles and to deposit a sheet on the pile by cams 73, 741 respectively engaging a roller on an arm attached to the bar 69. The conveyer shaft is driven from a gear 92 coupled by a chain 90 to a gearwheel 89 fixed to a gearwheel 57<1> driving the gear 57 and to another gearwheel connected by a chain-drive 86 to a gearwheel 85 fixed to the cam 10. The arrangement is such that adjustment on its shaft 11 of the cam 10 controlling the levers, 17, 8 simultaneously adjusts the gripper conveyer, and the cam 56, so that the delivery apparatus operates at the correct times in relation to the printing-machine operations. Smoothers.-Smoothing fingers 93 engaging the sheets on the cylinder 2 are raised as the nozzles are lowered towards the cylinder, by levers operated by a diaphragm, a chamber on one side of which is in communication with the interior of the tube 5. Endless-chain gripper-flyers.-The frame 75 carrying the conveyer is pivoted about the shaft 76 of the gearwheel 92 so that it can be raised to afford access to parts of the machine, and is supported by struts 77 with sleeves 79 slidable on pillars 80 and connected by chains 81 passing over pulleys 83, 83<1> 83<11> to a balance weight 82. Specifications 17,242/94, [Class 100], and 362,413 are referred to.