Patent GB-190917949-A (GB)
Title: Improvements in Multi-color Printing Presses.
Inventor: LOOZEN FRED HENRY VAN
IPC: B41F1/10
Filed: 1909-08-03
Granted: 1910-02-03
Abstract: 17,949. Loozen, F. H. van. Aug. 3. Feeding sheets and webs. -A multi-colour platen press with a fixed platen and reciprocating bed is adapted to print a number of multi-colour impressions on a long sheet automatically fed through the press by a reciprocating gripper - carriage, which intermittently grips the sheet ; the sheets are fed to this carriage by a similar but smaller carriage, which reciprocates once only during each series of printing operations. The platen is secured by bolts in an inclined feed-table 71, which is adjustably secured to brackets by means of bolts and nuts and is provided with an opening to receive the platen. The sheet to be printed is placed against a spring- controlled stop 108, which contacts with the feedboard when a sheet-feeding device 89, Figs. 1 and 4, is in the position shown in Fig. 1, and the grippers 90 of this device are open. The grippers 90 are carried by a carriage, which is reciprocated along a guide 73, attached to the feed-board, by means of an oscillating arm 93 connected by link 96 to an arm 97 depending from the carriage, the link 96 being provided with pivot adjustments to allow for the adjustments in the fixing of the feed-table. The stop 108 is raised, and the grippers 90 are simultaneously depressed to grip the paper, by the motion of a shaft 53 provided with cams 59, 60, which respectively actuate the grippers and the stop through a lever 107, link 106, crank-arm 105 on a tilting plate 100 which acts on an arm 103 of the grippers, and through a lever 114, link 113, and lever 112 on the arm of stop 108. The lever 114 is connected to a hooked arm 115, which is caused to engage a pin 93<a> on the arm 93 and thus connect this arm 93 to a cam-controlled lever 54, to which the arm 115 is pivoted. The lever 51 moves the arm 93 to the right, and the sheet is thus fed to a second carrier 74, and in its extreme position the grippers 90 are raised by the engagement of the arm 103 with a projection 117 on a lever 118 connected to mechanism which causes frisket fingers 70 to grip the sheet when released from the grippers 90. After each impression, grippers 77, constructed and operating similarly to the grippers 90, grip the sheet, and the carriage 74 is moved forwards by an arm 56 on an oscillating shaft 52. As the carriage moves backwards, the grippers 77 are released from the sheet, and the fingers 70 hold it in position. The carriage 74 is arranged to move the sheet at each reciprocation to an adjustable extent, so as to vary the number of impressions printed on each sheet by varying the point of connexion of an oscillating link 88 in a slotted arm 57 on the shaft 52, and to cause the feeding-device 89 to feed the paper at the correct time, the cam-shaft 53, which returns the arm 93 to its position shown in Fig. 1 by means of a cam 58, is rotated intermittently to an adjustable extent by means of a ratchet-wheel which is rotated by a pawl-wheel moved in one direction by a slotted arm 55 on the shaft 51, which is adjustably connected to a cord connected to the pawl-wheel, the pawl-wheel being returned by a spring and driving the ratchet-wheel in one direction only.