Patent GB-837582-A (GB)
Title: Improvements in or relating to cylinder flat bed printing machines
IPC: B41F3/20
Filed: 1958-03-13
Abstract: 837.582. Printing machines. Mc- LAUGHLIN, H. R. March 13, 1958 [May 17. 1957], No. 8099/58. Classes 100(1) and 100(2) Cylinder machines. In a cylinder flatbed printing machine wherein the cylinder is equipped with a spring-urged bar to grip a paper sheet, is adapted to roll on the type, and is articulated to a driven shaft for bodily movement therearound in a path consisting of an uppermost horizontal movement, a downward arcuate movement, a lower horizontal movement and an upward arcuate movement, there. are provided means for the controlled automatic rotation of the cylinder about its own axis during the downward, lower and upward bodily movement thereof for wrapping, printing and release by gravity of the paper, and means for preventing rotation of the cylinder about its own axis during the uppermost bodily movement thereof for correct presentation of the bar to the next paper sheet. The impression cylinder 11, Figs. 7 and 14, is rotatably mounted on links 14 pivoted to arms 13 fixed to a shaft 9 journalled in side frames 3, 4 and driven by a chain 10 from a shaft 5, which is rotated either by a handle or a motor. The cylinder 11 is thus moved bodily clockwise (in Fig. 14) along a path defined by cam tracks 17 formed on the frames 3, 4 and engaged by cam wheels 16 on the cylinder spindle 12. The wheels 16 also engage cam rails 35. On the lower run, wheels 18 on the spindle ride on horizontal rails 19, so that the cylinder roll over type 1 supported on a stationary bed 2. A chain 21 fastened to the frame 3 extends along the cylinder path except for the substantially horizontal upper run, and engages a sprocket 20 on the spindle, so as rotate the cylinder positivelycounter-clockwise about its own axis. On the upper run, a cam roller 33 extending from one wheel 18 engages cam rails 34, 34a fixed to one of the tracks 17, so as to restrain the cylinder against rotation, in order that it always arrives at sheet-receiving position in the correct angular position. Feeding and delivering sheets. The cylinder 11, Figs. 9 and 14, has secured thereto a pivoted gripper bar 22 held against the cylinder surface by springs 24 secured to pins 25 on the bar and to a fixture 26 within the cylinder, the springs passing through holes in the cylinder and bar. Sheets 30 are fed in turn from a table 31 by a conventional friction roller feed to the bar 22 at the point where the cylinder enters its right-hand and downward run, at which time a lug 28 on the bar engages a stationary cam plate 29 to move the bar away from the cylinder surface and receive the sheet, on to which the bar snaps shut when the lug rides off the cam plate, the cylinder then beginning its counter-clockwise rotation to wrap the sheet around itself, assisted by wrapping arms 82. After printing, the cylinder arrives at delivey position, Fig. 14, where a stud 89 on one of the wheels 18 engages a spring tongue 87 on a bracket 86 secured to a shaft 85 and raise it against gravity from a position resting on a stop on the frame 4, so as to rotate the shaft 85 and move a lever 83 secured thereto into the position shown in Fig. 14, where it engages the lug 28 on the bar 22 and opens the latter, the sheet falling by gravity on to a plate 92 and into a tray 90. The tray 90 is pivoted to lugs 91 and can be swung up to close the end of the machine. Inking apparatus. A duct assembly comprises a pair of plates 39, Figs. 7 and 14, rotatably supporting a transfer roller 38 rotated by a belt from the shaft 5, and a duct roller 36 forming with a duct plate 41 adjustable by screws 42 a trough for printing ink. The roller 36 is rotated through one tooth of a ratchet wheel carried on its spindle by a pawl 57 pivoted to a shaft 50 which is oscillated from the shaft 9 by a linkage 51, 52, 53. A transfer roller 37 is journalled in the ends 43 of a transverse strap 44 pivoted at 45 to the plates 39, and is normally held against the roller 38 by a spring 46 secured to a pin 48 on the strap. Once in each cycle a tripping trigger 55 on the shaft 50 engages a spring tongue 49 on the strap, to move the roller 37 into contact with the roller 36. An inking assembly comprises a pair of plates 59 supporting two inking rollers 61 and resting thereon a rider roller 64, axially reciprocated by a cam 65 thereon engaging a stud 66. A distributing roller 68 is journalled in the ends of a cradle 70 pivoted at 71 to the plates 59. A spring 72 normally holds the roller 68 in contact with the roller 64. The assembly includes track wheels 63 on the plates 59 and track wheels 62 on the spindles of the rollers 61, guiding it along rails 60. The assembly is reciprocated from the shaft 50 through linkage 74, 73 so as to roll once in each direction over the type 1 in each cycle. At the right-hand end of the assembly path, a lever 77 engages a roller 75 on an arm 76 fixed to the cradle 70 to swing the roller 68 into contact with the roller 38. Addressing machines. In order to use the above-described machine as an addressing machine, the type 1 is removed, and there is secured as an attachment to the machine an address-plate storage and feed apparatus comprising a magazine 97, Fig. 16, in which are stacked addressplates 95 having V-section runners 96 along each long side, the bottom plate rests on a pair of rails 98 secured to the magazine and to an address plate bed, with the runners 96 outside the rails. The rails are formed with recessed runways 100 in which a pair of slides 101 are reciprocated from the shaft 9 by linkage 107, 108, 106, 103, 102. Each slide carries a pivoted latch 109 biased to the vertical position shown by gravity. When the slides move to the right, the latches are swung counter-clockwise by the runners 96. After closing the runners the latches fall into vertical position, and on the leftward stroke of the slides, the latches engage the runners of the bottom plate and feed it on to the bed to printing position, the plate pushing the preceding plate to the left to fall inco a receptacle 114. The ends of the slides 101 prevent further clockwise rotation of the latches.