Patent GB-190713881-A (GB)
Title: Improvement in Printing Machines
Inventor: BROWN SUMMERS
Filed: 1907-06-15
Granted: 1907-12-31
Abstract: 13,881. Brown, S. July 9, 1906, [date applied for under Patents Act, 1901]. Right to Patent relinquished. Rotary machines; feeding sheets; inking-apparatus; stopping and tripping arrangements.-In a, hand-operated rotary sheet printing machine, the printing-cylinder has transverse removable bars for securing specially-shaped type ; the impression roller is hand-tripped or untripped, and is held in either position by a spring ; the ink ribbon is wound on spring-controlled rollers, and is partly unwound from the supply roller to the receiving- roller at each printing, and is returned by the springs in the roller. The sheets are fed from a hinged table G, Fig. I, with raising-devices, by a friction roller carried eccentrically on adjustable arms, so that the sheets ate delivered in correct position to the printing-cylinders. A pin W<3> engages with the teeth of the printing-cylinder spurwheel to lock the cylinder in any desired position. The method of securing the type F on the cylinder is stated to be an improvement on that described in Specification No. 11,501, A.D. 1904; this also applies to certain other details. The type F are formed either with holes or notches f, through which pass rods E for clamping the type on to the cylinder. The cylinder has grooves b, and side flanges in which are the holes e<1> for receiving the ends of the rods E. For convenience of typesetting a bar D is used to guide the fresh line of type into position, small end lugs of the bar D passing under rubber bands C, which pass round the flanges B<2> on either side of the cylinder and act as bearers. The rods E may be provided with notches at one end for convenience in withdrawing, and also for locking in position by wedges. The pile table G, hinged at h, is provided with a guide frame X similar to that described in Specification No. 22,017, A.D. 1905. The top. sheet is fed forward by a roller K mounted on arms K<1>, pivotally adjustable on a carrying shaft by the graduated disk R and clamping-screw R', so that the front edge of the too sheet is pushed forward at the right time to be gripped between the impression roller I and the rubber bands C on the printing-cylinder. The feeding-device is driven through a chain Q<1> and sprocket-wheels, one of which is disconnectible so as to render the feeddevice inoperative. The feed-table is normally held up by a rubber spring J against a nut L which acts as a stop, and, in order to keep the height of the top sheet constant as the pile diminishes, each depression of the table is made to turn the screwed spindle M through the ratchet-gear shown, the nut L being prevented from turning by a chain and pin, or other suitable means. The impression cylinder I is carried on pivoted arms I', and is held either in the operative or tripped position by an adjustable spring V, acting through a lever I<2> pivoted on one end of the impression cylinder shaft, and provided with an extension for raising or depressing by hand. The ink ribbon S passes only a short way round the. printing-cylinder, and is mounted on spring rollers T, U; these are similar to spring blind rollers, and have shafts with squared ends mounted in slotted arms, so that the tension of the ribbon, and the part to be used. may be easily determined. The ribbon is unwound from the top roller on to the bottom one by friction between the type and tho paper to be printed on, until that portion of the printing cylinder on which there is no type comes opposite the impression roller ; the ribbon then slips back to about its original position.