Patent GB-782633-A (GB)
Title: Improvements in or relating to printing machine
IPC: B41L45/00
Filed: 1956-01-02
Abstract: 782,633. Adding machines. ADDRESSOGRAPH MULTIGRAPH CORPORATION. Jan. 2, 1956 [Jan. 5, 1955], No. 39/56. Class 100(2) An addressing or like series-printing machine comprises an impression. plate over which a copy sheet to be printed may be passed, means for holding a master strip bearing images transferable by the simultaneous action of heat and pressure normally, in specad relationship above the path of the copy sheet, a heated platen disposed normally in spaced relationship above the means for holding the master strip, and means for operating the platen to force the master strip with pressure against the copy sheet on the impression plate. The machine comprises a head H supporting a platen 30 arranged to transfer images from a master strip MS on to a copy sheet CS supported on an impression plate 20. The images are printed on the master strip with an ink transferably only by the simultaneous action of heat and pressure, the ink comprising a wax selected from carnuba, paraflin and beeswax, gilsonite, a non-dryin gilsonite, a non-drying agent selected from the group consisting of castor oil, mineral oil and oleic acid, and a suitable colouring agent. The master strip is supported in a frame 25 including a pair of superimposed fingers 26, 27. The frame 25 is supported by a block 100 releasably mounted for pivotal movement about retractable pins 103 fixed to the machine frame which engages openings 104 in the block 100. The platen 30 comprises a base plate 31 provided with recesses 33S and 34S for heating elements and a recess 35S for a thermostat. The base plate to 31 is secured to a levelling plate 55 by a bolt 57, a pad of asbestos 56 being provided between the plates 31 and 55. Levelling of the platen 31 with respect to the plate 55 is effected by screws 75. The platen is guided for movement during a printing stroke by hollow bushings 51 and 52 anchored at their lower ends to the plate 55 and which slide over pins, as 52P, provided on a plate 60. held by spacer blocks to the head H. The platen is held in retracted position by springs as 66 connected between the plate 60 and the plate 55. Downward movement of the platen is effected by toggle links 83, 84 and 88, 89 connected to the plates 55 and 60 respectively and interconnected by a pin 87 to which is attached a yoke 95 operated by a drive link. Attached to the block 100 is a plate 115, a top portion 115A of which engages a stop screw 110 in an arm 111 attached to a plate 112 of the machine frame, The frame 25, which is biased by a torsion spring for clockwise rotation as viewed in Fig. 5 is thus prevented from contacting the platen when the latter is in a retracted position. For moving the frame 25 against the copy sheet as the platen moves downwardly a plate 117 is attached to the platen and is provided with an adjustable screw 118 adapted to engage the lower portion 115B of the arm 115. The frame thus descends in spaced relation to the platen 30 until it contacts the copy sheet, whereupon the portion 115B yields to allow the platen 30 to descend further and press the master sheet with heat arid pressure against the copy sheet. Specification 703,336 is referred to.