Patent GB-145693-A (GB)
Title: Improvements in or relating to printing machines
IPC: B41F17/00
Filed: 1920-06-30
Abstract: 145,693. Dorel, J. June 17, 1919, [Convention date]. Copying documents, drawings, and the like; cylinder machines; tripping - arrangements; inking-apparatus; printing-surfaces. - In a machine for copying maps, drawings, or other documents, of the kind in which a photoferrogelatinographic printing-surface is secured on a frame on which reciprocate two carriages one carrying inking-rollers and the other an impression cylinder, the sheets to be printed are gripped on to the impression cylinder by a bar connected to two members freely rotatable upon the shaft of the impression cylinder and controlled by springs and cams to effect the gripping and release of the sheets. Fig. 6 is a side view of the machine, and Fig. 1 a side view of the carriages. The frame comprises side bars 1, 2 having extensions 4 to support a pile table 5 and a delivery table 6. A table 7 is provided for the preparation of ink. The inking roller carriage A comprises side plates 9 carrying guide rollers 14, 15, 16 engaging the bars 1, 2 and gear wheels 20 engaging racks 21 on the bars 1, 2. The inking- roller 24 and ink-supply roller 26 are mounted in vertical slots 22 in the plates 9. The shaft 23 of the roller 24 rests in hooked links 46 pivoted to arms 44 on a rock-shaft 12 to which is secured an arm 43 engaging the top of a rod 37 vertically slidable in a block 30 fixed to one of the plates 9. The shaft 25 of the roller 26 rests on the arms 44 and also on a longer pair of arms 49 connected bv a tube 50 loose on the roll shaft 12. One of the arms 49 rests on the top of a second rod 38 vertically slidable in the block 30 and pressed upwards by a spring 41. The rods 37, 38 are controlled by plates 31, 32, Figs. 11 and 12, which can slide in the block 30 and through notches 78, 79 in the rods. The plates 31, 32 have notches 77, 80 respectively which, when the plates are in a certain position, allow the rods to fall under the action of the weight of the rollers 24, 26, and the plates are automatically actuated at the ends of the strokes of the carriage A by engaging with spring buffers 75, 76, Figs. 1 and 11, at one end, and similar buffers 87, 88, Fig. 5, at the other end. The buffers 87, 88 are carried b a pivoted member 82 which during the inking of the printing surface is held in the position shown in broken lines by the engagement therewith of a roller 114 on the impression carriage which is held in the position l, Fig. 6. Any one of the buffers may be held in an inoperative position as shown in Fig. 5 by stop pins 100. Spring buffers 72, 86 are also provided to check the carriage A at the ends of its strokes, and the carriage is locked in its initial position shown in Fig. 1 by a block 65, carried by a pivoted spring held lever 62, engaging a slot 66 in the bracket 53 secured to the bar 1. In this position the parts of the inking apparatus are normally in the positions shown in Fig. 1 with the roller 24 raised above the level of the printing surface 92 and the roller 26 separated from the roller 24, the rod 37 being held in raised position by its engagement with a vertically slidable block 56 resting on a hand-operated eccentric 57. To ink the printing surface 92, the operator releases the locking block 65 and pushes the carriage to the right by means of the handle 69. As the rod 37 moves down the incline 55 on the bracket 53, the roller 24 contacts with the printing surface and the roller 26 engages the roller 24. Near the end of the stroke the rod 37 rides up the incline 98 on the member 82 so that the rollers are again raised. The plates 31, 32 are then moved by the buffers 87, 88 if they are both in their operative position, to lock the rods in their raised position during the return stroke of the carriage until the plates are returned to their initial position by engagement with the buffers 75, 76. By placing the buffer 87 in an inoperative position, as shown in Fig. 5, the roller 26 only is held raised during the return stroke, and by holding both buffers 87, 88 out of operation both rollers may remain in their lower position during the return stroke. Also by moving the buffer 76 into an inoperative position before the return of the carriage, the next inking stroke may be effected with the roller 26 out of contact with the roller 24. To prepare the roller 26 with ink, the eccentric 57 is turned to allow the rod 37 to fall and bring the rollers 26, 24 into contact. Pivoted plates 101, Fig. 1, are then turned to bring pins 103 carried by them into the path of cam projections 106 on the ends of the roller 26, so that upon rotating the shaft 25 by means of a handle the roller is reciprocated longitudinally to distribute the ink previously placed upon it. The pins 103 are then placed in the inoperative position and the shaft 25 locked against endwise movement. To clean the rollers 24, 26, a straight edge 109 is held in contact with the roller 26 while the shaft 25 is rotated. The rubber impres. sion roller 121 is supported by springs 134 in a carriage B comprising side plates 110 guided on the bars 1, 2 by smooth wheels 114 and gear wheels 116. Circular disks 25 loose on the shaft 119 of the roller 121 engage encentric disks 128 fixed to a shaft 120 on which is an operating arm 129 the rotary movement of which is limited in both directions by the engagement of blocks 132, 133 on the arm with the shaft. 119. The impression pressure may be adjusted by screws 136. Two members 153, Figs. 1 and 18, loosely mounted on the shaft 119 are connected by a sheet gripping bar 159 which is pressed towards the roller 121 by springs 155. The members 153 have caps 156 provided with swells 157 to cooperate with cams 163 on the carriage B, and one of them also has side projections 160, 161 to cooperate with a fixed pin 162 on the adjacent plate 110. The feed table 142, provided with suitable adjustable sheet registering devices, is secured on bars 138 extending from the plates 110 and has a slidable extension 151 connected by a bell-crank 146 to a strap 148 loose on the shaft 119. In operation, the arm 129 is turned through 180‹ from the position shown in Fig. 1, so that the roller 121 is raised from the printing surface 92 as shown in Fig. 18. The members 153 thereupon assume the vertical position, the bar 159 being held clear of the roller 121 by the cams 163 and the extension 151 is projected into engagement with the bar 159. The sheet F to be printed is laid on the bar 159, and the arm 129 is turned to throw on the impression. The members 153 are thereby turned by the engagement of the projection 160 with the pin 162, to grip the sheet against the roller 121 and the extension 151 is simultaneously withdrawn. As the carriage moves to the right the sheet is carried round until the swells 157 engage pins 181, as shown in Fig. 20, which are raised by engagement with inclines 179 on bars 90 fixed to the frame bars 1. The bar 159 is thereby raised to release the sheet which is then held by a disk 169 carried by an arm 166 pivoted to one of the plates 110. The sheet is taken off the roller 121 by hand. Near the end of the stroke of the carriage B, the pins 181 run down inclines 180 on the bars 90 allowing the bar 159 to again grip the cylinder. The arm 129 is then given an impulse in the direction to throw off the impression and the abutment 161 in striking the pin 162 causes the members 153 to return to their normal position carrying with them the roller 121. The operator then pulls the carriage B further to the right until a vertical spring pressed locking pin 171 falls into a recess 178, and during this movement a projection 182 on the carriage B engages a rod 183 to compress a strong spring 184, which upon the release of the locking pin 171, propels the carriage back to its initial position in which the pin 171 drops into a second recess 177. The printing surface 92 is secured at one end by headed pins 97 to a metal plate 93 which is also secured by the pins 97 to a box 94 which is provided with partitions between which cooling water is constantly circulated. In a modified construction of inking apparatus, a single inking roller is employed, and consisting of a gelatine covered metal muff which is mounted on its shaft with sufficient clearance to allow it to press on the printing surface by its own weight. An ink distributing table is also mounted on the frame at each end, and the tables are pivoted to facilitate the fixing of the printing-surface.