Patent GB-348025-A (GB)
Title: Improvements in or relating to printing machines
IPC: B41L19/00
Filed: 1930-01-31
Abstract: 348,025. Printing-machines. ADDRESSOGRAPH CO., 901, West Van Buren Street, Chicago, U.S.A. Jan. 31, 1930, No. 3425. Convention date, Nov. 1, 1929. [Classes 100 (i) and 100 (ii).] Rotary machines.-A machine for printing bills, statements, &c., which is more especially adapted for printing fixed matter on sheets already printed with variable matter by means of an addressing- machine such as described in Specification 348,022 comprises feeding and registering means for the sheets, and printing-mechanism in the form of an impression roller 13 geared to a printing-roller 2 and driven from a vertical shaft 6, Fig. 3, which is itself driven by bevel-gearing from a horizontal driving- shaft 9. The printed sheet is delivered in known manner by a sheet guide 64 and a conveyer 65<1>. Impression adjustments; tripping-arrangements.- The impression roller 13 is mounted on the arms 17 of a pivoted yoke 18 mounted with the aid of an extension arm 21 on a shaft 19 in an elongated bearing 20. The roller 13 is moved towards the printing-position by an adjustable spring 25, and the extent of movement of the roller 13 is limited by a stop lug 28 which engages an adjustable screw 31 with a machined head 30 carried by an arm 17 of the yoke. The roller 13 is raised out of printing position for a portion of each rotation by means of a cam 32 on the shaft 9 which acts on a roller 34 carried by a rigid lateral extension 33 on the arm 17. If a sheet is absent, the roller 13 is held out of printing position by means of a stop lug 36 which swings in under a lug 37 on the arm 17 when a roller 40 which acts as a feeler is unsupported by a sheet and so falls and permits rotation of the shaft 38 of the lug 36. The feeler is reset by cam mechanism at each operation of the machine. Sheet-registering devices; dropping-roller feeds; sheet-guides.-The sheets, which may be received from an addressing-machine as described in Specification 348,022 are passed by belts 69 along a guideway 1, led between lower feed rollers 45 and upper feed rollers 44, Fig. 4, and are guided by guides 63 to front stops 60 carried by arms 61 mounted on a shaft 62 which is oscillated from a cam 55 on the shaft 9. This cam 55 also oscillates the shaft of the arms 39 in which the roller 44 is mounted, and the whole mechanism is timed so that the stops 60 rise just prior to the dropping of the roller 44 which is timed to advance the sheet as the printing-rollers come into operation. Inking-apparatus.-The printing-cylinder 2 is inked by two rollers 85, Fig. 1, fitted with distributing rollers 78, 88, supplied by an oscillating messenger roller 103 from a duct roller 101 mounted in a duct 100. The rollers are mounted in a frame A formed of open side members 75 and cross members. The frame A is carried by an eccentrically mounted pivot pin 77. The frame can be moved around its pivot by means of a link 78 connected to a bell crank 79 operated by a control rod 80. The bell crank 79 is provided with an adjustable stop lug 81 which engages a fixed lug on the machine frame and allows of adjustment of the frame A. The shafts 86 of the rollers 85 are geared to the printing- roller 2. The rollers 85 can slide in their bearings and are reciprocated axially therein by frictional contact with the rollers 87, 88 which are reciprocated axially by a cam at the bottom of the shaft 6 and a swinging frame with forked ends which engage spaced collars at the ends of the shafts 89. The rollers 87 are mounted in yokes 90, 91 pivoted at 92 to the frame A and are normally pressed upwards by springs 95 so as to cause the rollers 87 to engage the rollers 85. The rollers 87 are automatically depressed out of contact with the rollers 85 when the frame A is moved out of operative position, by a fixed pin which engages an arm on the yoke 90. The rollers 87 can be depressed by hand operation of a rock shaft 97<1> with an arm 99 engaging an arm 96 on the yoke 80. The messenger roller 103 is mounted in a pivoted yoke 104 normally raised by a spring 106 to an extent limited by a screw stop 107 on the yoke 91. The yoke 104 is periodically depressed by a bell crank actuated by a cam on the shaft 6. The bell crank is pivoted coaxially with the duct roller 101, and at its bottom end carries a pawl for rotating the duct roller 101 intermittently. This inking-apparatus now forms the subject-matter of Specification 349,920. Printing-surfaces.-The printing-surface 5 is secured to a split steel ring 131, Fig. 7, which is mounted on a drum 127 formed with a bevelled shoulder 128 between which and a similar shoulder 130 on a cap 129 the ring 131 is clamped, when the cap 129 is moved axially by a nut 134. The ring 131 is positioned by means of a slot 133 engaging a pin 132 on the drum. The improvements on the printing-surface form the subject-matter of Specification 349,922. Impression-surfaces.-The impression cylinder 13 is fitted with a rubber blanket 135 fastened at one end 136 to the cylinder. The other end of the blanket is provided with a rack-bar 137 which by means of a block 1371 is held engaged by a pinion 138 on a ratchet-shaft 139 controlled by a pawl 141. By rotating the shaft 139 the tension of the blanket can be adjusted. The cylinder 13 is locked to its shaft by a dog 142 engaging recess in a collar 143 fixed to the shaft, and by releasing the dog 142 the cylinder can be turned to any desired position to enable the blanket 135 to be adjusted and replaced. The impression-cylinder forms the subjectmatter of Specification 349,921.