Patent GB-408469-A (GB)
Title: Wiping and polishing mechanism for steel plate printing machines
IPC: B41F9/14
Filed: 1933-06-14
Abstract: 408,469. Printing - machines. ROWLAND, M. F., 56, Ludgate Hill, London.- (American Bank Note Co. ; 70, Broad Street, Manhattan, New York, U.S.A.) June 14, 1933, No. 16991. [Classes 100 (i) and 100 (ii).] Inking - apparatus ; feeding webs.-A wiping and polishing mechanism for rotary steel plate printing-machines comprises a wiping-platen, a web-feeding mechanism arranged in front of and adapted to advance the web towards the platen, a take-up or rewind mechanism, an intermittently operative actuating means simultaneously operative upon the feeding and take-up mechanisms, and means whereby the actuating means may be adjusted to regulate the quantity of web fed and taken up with each actuation of the said means. A polishing-platen together with similar webfeeding and take-up mechanisms is also provided. The amount of web fed and taken up is adjusted according to the size of printing- plate, and a saving of ink is thereby accomplished. The cylinder 10 is shown as carrying two steel intaglio printing-plates 11, 12 with which co-operates the wiping-mechanism comprising two platens 13, 14 of the usual construction, reciprocated longitudinally of the cylinder by known means. A wiping-web 16 passes from a roll supported at 15, around a guideroller 19, between feed-rollers 17, 18, around a guide-roller 70, over the platen 13, around a weighted guide-roller 20, over the platen 14, and around a guide-roller 71 and a rewindroller 22, the latter roller rewinding the web, by frictional contact, on a reel 72 mounted in slotted bearings 21. One feed-roller 17 is connected by sprocket -and -chain means to the rewind-roller 22, and both rollers are of the same diameter. The arbor of the rewind-roller 22 carries a friction-clutch member of the ratchet type provided with tapered recesses in which are seated one or more balls or cylinders which only allow one-way rotation of the roller 22. A gear-wheel 35 is mounted on the clutch member, and meshes with a rack 38 guided for reciprocation by means of a connecting-rod 39 pivotally connected with the rack and with a block 40 adjustably secured in an elongated slot 41 in an oscillating arm 27. The aim 27 is.pivotally mounted at 31, and carries an antifriction roller 32 adapted to ride in the track of a cam 26. The cam is secured to the same shaft as a gear-wheel 30 which is driven through an idler gear-wheel 29 by a gear-wheel 28 secured to the cylinder 10. In the machine shown, the gear-wheel 30 is one half the diameter of the gear-wheel 28, so that the cam 26 receives one complete revolution for each printing-plate upon the cylinder 10. When the cylinder 10 is rotated the cam 26 swings the arm 27, movements to the right imparting a counterclockwise rotation to the rewind-roller 22 and. the feed-roller 17. The amount of movement of the wiping-web may be varied by adjusting the position of the block 40 in the arm 27. The polishing-mechanism comprises a single platen 46 over which passes a polishing-web 48 supplied from a reel supported at 47. The web passes around from a reel supported at 47. The web passes around a guide-roller, between a pair of feed-rollers 50, 51, around guide-rollers 52, 53, over the platen 46, around a guide-roller 55<a> and a rewind-roller 55, the latter rewinding the web, by frictional contact, on a reel 73 supported in slotted bearings 54. One feedroller 51 is connected by sprocket-and-chain means to the rewind-roller 55 which is provided with a clutch member of the same type as that provided on the rewind-roller 22, but in this case the rewind-roller 55 is adapted to be rotated in a clockwise direction. A gear-wheel 63 mounted on the clutch member is meshed with a rack 66 reciprocated by a connecting-rod 67 secured to a block 68 adjustably secured in the slot 41 in the arm 27. The cam 26 is provided with a rise 42 and a substantially diametrically opposed fall 43, and two concentric or rest portions 44, 45, the arrangement being such that the wiping and polishing webs are moved only when they are not contacting the printing-plates, and so that full feeding movements may be imparted thereto when the largest plates are mounted on the cylinder 10. The polishing - web may be actuated independently of the wiping-web.