Patent GB-168323-A (GB)
Title: Improvements in or relating to machines for marking perforated music rolls
IPC: B21D53/82
Filed: 1921-08-23
Abstract: 168,323. Marshall, E. J., (Assignees of Meahl, P. J.). Aug. 24, 1920, [Convention date]. Printing-surfaces; i n k i n gapparatus; rotary machines; stopping arrangements.-A machine for marking perforated music rolls with printed characters in registration with the lines of perforations, conveniently at the margin of the sheet, comprises a printing drum with a peripheral helical groove in which the printing slugs are secured, and means for simultaneously rotating the drum and advancing it in an axial direction so that the printing slugs are presented successively in position for printing in register with the successive lines of perforations. Means may be provided whereby the machine may be set to print a predetermined length of the main roll, and then to be stopped automatically and reset ready for operation on the next roll. As shown, the printing drum 22 is mounted on the hollow spindle 19, which is supported at one end in bearings 12 on the frame 11 and at the other by an arm 17 depending from a supporting rod 16 adapted to be fixed in an extension 14 of the frame. By releasing the set screws 21, the conical plug 10 at the end of the hollow spindle 19 may be released from the recess 18 in the depending arm 17 and the latter may be swung up, so that the printing drum may be slid off the spindle for more convenient setting of the printing slugs 24 in the helical peripheral groove 23. The drum 22 is driven from the hollow spindle 19 by means of a radial pin 26, Fig. 4, passing through flanges on a disc 25 bolted to the drum and extending through a slot 27 in the hollow spindle 19, said disc 25 having concentric slots 25<a>, Fig. 3, engaging bolts 22a on the drum so that the latter may be adjusted to correct position relatively to its spindle before the printing commences. The radial pin 26 is secured to the rotatable head 28<a>, Fig. 4, on the end of a rod 28 passing through the hollow spindle 19 and provided at the end with a rack 29<b> engaged by a rotating pinion 31. By this means, the printing drum is rotated and advanced axially along its hollow spindle 19 as the printing proceeds, whereby the helically-arranged printing slugs are presented in position for printing against the impression roller 80. The hollow spindle 19 is driven by means of a continuously driven worm-wheel 39 loose thereon, but adapted to be engaged by a sliding clutch-member 44 keyed tc the hollow spindle and actuated by a pivoted lever 48 under the control of a push-rod 46. When the clutch-member 44 is moved into driving position, a bent extension of the clutch-lever 48 actuates a rod 85 connected to an arm 84 on a shaft 82, thereby lifting an arm 81, Fig. 3, engaging the pivoted lever 78 supporting the impression roller 80 so that the latter is raised into contact with the printing drum. At the same time the lever 78 moves the ink-transfer roller 74 into contact with the printing drum. The machine is stopped automatically when a predetermined length of the music roll has been printed by means of a cylindrical sleeve 51, which is keyed to the hollow spindle 19 and has a peripheral helical groove 55 corresponding with the helical groove on the printing drum and engaging the end of a tripping-dog 54. Coacting with the latter is a cam 59 on a lever 57 pivoted to the clutch-lever 48 and provided with a series of apertures 58 in any of which the cam 59 may be set according to the length of roll to be printed. By the time an impression has been made from the last one of the printing slugs, the tripping-dog 54 will have moved along the slot 53 into contact with the cam 59, which is thereby lifted, thus raising the lever 57 and disengaging a retaining notch thereon from the shoulder 56, with the result that a coil-spring 48<a> throws out the clutch 44 and stops the machine. Thereupon, a weighted cable 37, which has been wound on the drum 33 during the progress of the printing by means of a bevel gear 34a on the spindle 19 engaging a bevel gear 34 on the drum 33, commences to unwind and returns the drum to its starting position, the impression roller 80 and ink transfer roller 74 being moved out of contact with the printing drum by means of the rod 85. The paper is pulled through the machine by a driven rubber-covered roller 88, Fig. 3, tension being provided by a grip roller 92 mounted in parallel arms 93 and forced against the roller 88 by a compression spring 96.