Patent GB-840869-A (GB)
Title: Improvements in and relating to intaglio printing presses
Inventor: GILLIS EDMUND ANTHONY
IPC: B41F9/14
Filed: 1958-06-21
Abstract: 840,869. Printing machines. CRONITE CO. Inc. June 21, 1958, No. 19938/58. Class 100(2) In an intaglio printing press an endless belt for wiping the surface of the die is normally fed step-by-step beneath a wiping pad by means actuated from the drive to the press, and an electric motor is provided for advancing the belt through an extra long step when the approach of the seam in the belt to the wiping pad is detected. General arrangement. A shaft 30, driven by an electric motor (not shown) carries a pinion 31 which engages gear wheels 32, 44 secured to shafts 33, 43 respectively. A disc 37 mounted on the shaft 33 carries a pin 38 which engages a cam slot 36 in an arm 35 pivoted at its lower end to the machine frame and at its upper end to a link 40. The link 40 is connected to the die 41 so that as the arm 35 is oscillated by the rotation of shaft 33 the die 41 is reciprocated horizontally on slides secured to a portion 15 of the machine frame. A cam 69 mounted on shaft 43 engages a follower on one arm of a bell-crank lever 66 which is pivoted to the machine frame at 65 and connected by a link 74 to an arm 72 rigid with a shaft 76. Also rigid with the shaft 76 is an arm 77 carrying a roller 78. The action of the cam 69 oscillates the arm 77 from the position shewn in which the roller 78 engages an ink fountain roller 82 to a position where the roller 78 engages and inks the upper face of die 41 as it reciprocates on its slides. The follower on the bell-crank lever 66 is held in engagement with the cam 69 by a spring 71. Above a platen P a ram 50 is mounted for vertical reciprocation by a link 48 pivoted to an eccentric pin 47 on a disc 45 which is mounted on the shaft 43. The ram 50 descends to make an impression when the die 41 is positioned over the platen P. A bell-crank lever 54 pivoted to the machine frame at 53 carries at the end of one arm the wiping pad 51 and at the other a roller 58 which acts as a follower for a cam 59 mounted on the shaft 43, a spring 62, holding the roller 58 in engagement with the cam. The action of the cam 59 is such that the wiping pad 51 is in its lowest position as the die 41 is passing beneath it and is then raised. Wiper band mechanism. An endless band 126 having a seam 170 is passed beneath the pad 51 and provides the surface on which the die 41 is wiped as it moves from inking to printing position. The band passes round a roller 121 which runs in a bath of ink solvent, between feed rollers 92, 93, round an idler roller 115, a weight 127 for taking up the slack in the band, idler rollers 114, 111, and between rollers 103, 101. A shaft 203 carrying a sprocket wheel 206 is rotated intermittently through a ratchet wheel 204 and a pawl 205 which is fixed to an arm 202 oscillated through a link 200 by an eccentric pin 33b on a disc 33a mounted on the shaft 33. The drive from the shaft 203 is transmitted by a sprocket chain 207 to a shaft 100 on which is mounted the roller 101, and thence by a sprocket chain 109 to the shaft of the feed roller 93 which is geared to that of the feed roller 92. By these means the band 126 is advanced one step each time the pad 51 is raised so that a clean portion is presented for wiping the die after its next inking. So that the die is not wiped with the seam 170, the latter is detected as it passes between rollers 210, 212 and the roller 212, which is resiliently mounted, actuates a switch 215. Actuation of the switch 215 closes the circuit of a latching relay connected in the circuit of a second electric motor which is coupled through an overrunning clutch to the shaft of the feed roller 93. A switch 173, actuated by the cam 59 through the roller 58 ensures that the second motor is set in motion only when the pad 51 is in the raised position. The second motor rotates the rollers 93, 92 at a higher speed than that at which they are driven by the shaft 30 so that the join 170 is carried past the pad 51 before the die 41 next reaches wiping position. Provision is made in the circuit controlling the second motor to prevent its actuation if, when the main press drive is disconnected, the join 170 comes to rest between the rollers 210, 212. An inching switch is provided so that the second motor may be used for running the belt 126 through the press for cleaning when the main drive is disconnected. In a modification the join 170 is detected as it passes between the rollers 101, 103, the roller 103 actuating the switch 215. Specifications 672,315 and 740,727 are referred to.