Patent GB-190113646-A (GB)
Title: Improvements in Platen Printing Presses.
Inventor: THOMSON JOHN
Filed: 1901-07-04
Granted: 1901-08-31
Abstract: 13,646. Thomson, J. July 4. Platen presses.-Relates to improvements applicable to machines such as the " Colt's armory "press." The friction clutch through which the machine is driven has that part of it which is fast on the driving-shaft provided with a rim by which the machine may be turned by hand when desired. The means for throwing-off the impression consists of eccentric sleeves 34 having transverse projections 33 engaging slots in the bentover ends of the throwoff bar 30. Under the projections 33 are springs 36 engaging removable bridge-pieces 37 on the ends of the bar 30. These springs hold the bar 30 in engagement with retaining latches on the platen A, and the bar may be lifted out of the latches against the pull of the springs 36, and then be swung down. Thepivoted frame of the frisket fingers 45 is provided with a pin 50 engaging stops on the platen frame to limit the movement of the fingers. The frisket frame is pressed by a spring rod 51 passing through a pivoted stud 52, and in order that the fingers may be depressed on to the platen when the latter is open, the stud 52 is mounted on a lever 53 pivoted at 54 and connected by a rod 55 to a treadle 56 or to a band-lever. The hook connection 58, 61, which engages the pin 62 on an arm of the shaft 74, is disengaged, when desired, by a pivoted curved shoe 59 engaging a roller 63 on the hook. The shoe 59 is moved by a rod 60. The shaft 74 operates the reciprocating roller carriage B through arms 73 and links 72. The hook 58 is pivoted to an arm 75 on a shaft 76 rocked by two arms 77 thereon engaging camgrooves 82 in the inner sides of the main gearwheels 84. The carriage B and its connections are counterbalanced by two volute springs 85 applied to the shaft 74. Ink is supplied to the forme rollers 66, 67, 68, 69 in the carriage B by two drums 70, 71, and the ink is distributed and supplied to these drums from the ink-duct roller by a vibrating composition roller 91, a metal distributor roll or " changer" 92, composition rollers 93, 94, 95, 96, and a metal riding roller 97. The roller 97 is in a vertical slot 99, and presses the rollers 93, 95, which are in horizontal slots 98, against the roller 92 and the drums 70, 71. Some of the rollers may be omitted when less distribution is required. Two separate colours may be applied, one colour to one end of the roller 94 and drum 70 and the other to the opposite end of the roller 96 and drum 71. The roller 91 is in a vibrating frame 101 pivoted at 102 and operated by an arm engaging a cam-groove in the outer side of one of the gear-wheels 84. The arm is adjustable in length to vary the movement of the frame 101. The duct-roller is moved by a pawl 116 on an arm 114 geared to a toothed segment on an arm 112 rocked by an arm 111 and cam-groove 109 in the outer side of the other gear-wheel 84. The extent of movement of the duct-roller is regulated by a plate which engages the pawl 116 permitting it to engage one, two, or more teeth of its ratchet. This plate is moved by an arm 119 and an operating- rod 123. The ductor blade is adjusted with relation to the duct-roller by a series of short cylindrical pieces of metal in channels in the frame of the ink-duct, and moved by screws 128. The movable journal boxes 132 of the inking-rollers are provided with projections on their upper and lower ends engaging vertical slots in the projecting parts 131 of the carriage frame B.