Patent GB-184175-A (GB)
Title: Improvements in or relating to printing press bed movements
IPC: B41F3/58
Filed: 1922-07-27
Abstract: 184,175. American Type Founders Co., (Assignees of Kelly, W. M.). Aug. 6, 1921, [Convention date]. Bed reciprocating and cushioning apparatus.- A cylinder machine of the two-revolution type is constructed with improvements in the bedreciprocating and cushioning apparatus. The bed 56, Fig. 3, is reciprocated, for the greater part of its motion, by a rack 55 and an oscillating gear wheel 54 on a shaft 53 driven by a train of gears from a shaft 31, Fig. 1 (Cancelled), driven by a belt 32 from the main driving-motor 30. This train of gears comprises two wheels, such as 43, Fig. 3, geared directly together and each fitted with a segmental gear, such as 49, which alternately drives the shaft of the wheel 54 in opposite directions, with a period between the drives in which the bed is driven by a crankmechanism comprising a slide 69, Fig. 4, reciprocated by a crank-pin 48 on a shaft 46 also driven from the shaft 31. This slide 69 has pivoted rack-engaging members 74, 75 of the kind described in Specification 120,823, operated by cams 80, 85 to engage the rack 55 during the periods in which the segmental gears 43 are out of action. To minimize friction, the bed 56 is reciprocated over four parallel ways 57 in which are mounted slides supporting rollers 59 on which the bed rests. The slides are connected transversely in pairs, and each pair is reciprocated at half the speed of the bed by means of gears 67, 68 on the shaft 54 which engage racks on the slides carrying the rollers 59. The bed is fitted at each end with a pair of pistons which engage cushioning cylinders at each end of the stroke. The cylinders are connected by air pipes and non-return valves to pipes 89 containing relief valves 91, the pipes normally acting independently. They can however be connected by a plug cock 90 to enable the air from one pair of cylinders to exhaust into the other pair at the commencement of the bed motion. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following subject-matter, which does not appear in the Specification as accepted:- Inking-apparatus.-The forme is inked by a series of rollers 92, Fig. 1 (Cancelled), mounted in adjustable bearings 93, and ink is applied and distributed to the rollers 92 from a duct roller 100 by a messenger roller on a vibrating arm operated by cam and lever mechanism. The roller 100 is intermittently rotated by cam-operated ratchet and pawl mechanism. The messenger roller delivers the ink to a tubular roller 99, between which and the rollers 93 are two lower rollers 97, Fig. 19 (Cancelled), and two upper rollers in contact with these, all mounted in a pivoted frame 94 and all driven directly by gearing from the gear 54 which reciprocates the bed. The frame 94 is normally held in operative position, with its free ends resting on lugs 103 on the cylinder housings of the press, by arms 104, which can be rotated to the position 109 to hold the frame 94 in the tripped position shown by the dotted lines 108, Fig. 1 (Cancelled). The distributing rollers 97 are reciprocated longitudinally by the engagement of screwed threads 135 on their shafts with nuts 136 secured by bolts 137 to the frame 94. By loosening bolts 137, the nuts may be permitted an axial movement which reduces the extent of reciprocation of the corresponding roller 97. The two rollers may thus be reciprocated to a different extent, and the distribution and cutting-up of the ink is thus improved. Tripping-arrangements.-The impression cylinder is normally raised and lowered automatically by means controlled from a cam 141, Fig. 10 (Cancelled), on the shaft 44, but this means can be put out of action by a pedal or automatically, so as to leave the cylinder in its raised position if desired. The cam 141 normally oscillates a rock-shaft 149 by means of an oscillating lever 144, connected by a pin 146 and a gab hook 147 to a link which oscillates the shaft 149. The shaft 149 operates by means of levers 151 and rods 152 to rotate spring-controlled levers 153 on shafts 154, fitted with eccentrics 156 which operate rods 157 connected to bearings 139 at each end of the cylinder 138. The rods 152 are fitted with turnbuckles which permit the printing pressure to be adjusted as desired. To trip the cylinder, a pedal 166, Fig. 1 (Cancelled), is depressed against the action of a spring 170, and this moves a lever on a shaft 172,. fitted with an arm 176 having a pin 177 which can raise the hook 147 out of its connection with pin 146 and thus disconnect the normal raising and lowering mechanism. To prevent the hook from being disengaged except at the time when the cylinder is in its raised position, a latch 178 acts on the arm 176 to restrain it from movement normally, but this latch is released when the cylinder is in its raised position by a pin 185 on the lever 144. The pedal 166 may be held in its depressed position, and the shaft 172 may be actuated automatically, by means controlled by the sheets. Gripper mechanism.-The grippers on cylinder 138 are mounted on a shaft 186, Fig. 12 (Cancelled), fitted with a spider arm 187 provided with radial recesses 188, 189, which are adapted to be engaged by pins 190, 191 for operating the grippers. These pins are actuated bv mechanism on the outside of the side frame and the cylinder housing, and comprising arms 196, 197, Fig. 1 (Cancelled) on a vertical shaft 193 which is oscillated by cam and lever mechanism from the shaft 42. A spring 192 acting on the arm 187 maintains the grippers in either their closed or open position.