Patent GB-190713848-A (GB)
Title: Improvements in and relating to Printing Machines
Inventor: BONHAM HERBERT
Filed: 1907-06-15
Granted: 1908-04-09
Abstract: 13,848. Bonham, H., and Scott, J. W. P. June 15. Cylinder machines with plane printing-surfaces. -The cylinders of printing-machines, more particularly of the two -revolution class, are raised and lowered from the reciprocating bed by means of mechanism actuated from a slotted star-shaped disk rotated intermittently by pins on a rotating disk or segment, and means are provided in connexion with this for maintaining the cylinders clear of the bed to allow of inking up, and to prevent an impression by the cylinder when no paper. is present. As applied to a two-cylinder machine, Fig. 1, the machine is driven from a pulley-driven shaft 12, which through gearing 15, 16, and preferably eccentric gear 17, 18 to give a slow motion to the cylinders when the bed is being reversed, drives a wheel 20 geared to two pinions 21, 22. The pinion 21 engages a pinion 24 on the right cylinder 2, and is carried by links 25 so as to keep it on the pitch lines of the wheels 20, 24. The pinion 22 is arranged on a shaft which is connected by a universal joint 7, Fig. 4, to a shaft 6 provided with a pinion 5 engaging a crescent mangle-wheel formed of teeth 3 arranged between the driving-wheel 1 of a reciprocating rack 11 on the bed and a disk 4 on the shaft 6. The wheel 5 is provided with a pin 43 which engages projections 8 on the wheel 1 at proper times to make the wheel 5 engage alternately with the inside and outside of the wheel 3, thus causing the wheel 1 and the bed to be reversed. This arrangement may be replaced by a pinion reciprocated vertically to engage straight racks. The wheels 1, 20, 24 are preferably of the same diameter. On the shaft 15 is fitted a disk or segment 26 with two pins, or rollers 27 which engage alternately slots 29 in a star-shaped, disk 28. On the shaft of the disk 28 is an eccentric 32 connected by a link 33 to a lever 34, which is thus oscillated, and through mechanism, such as connecting-rods 36 joined to bearings 38 which move in guides 39, the cylinders are raised and lowered alternately. The four positions assumed by the lever 34 in each cycle correspond to the positions of the bearings 38 in which (1) one cylinder is down and in engagement with a rack 40 and the second cylinder 19 raised, (2) both cylinders are slightly raised, (3) the second cylinder is lowered and the first raised, and (4) the cylinders are again raised as in (2). The cylinders may be used without the usual springs, and two eccentrics 32 may be used. As applied to a perfecting-machine, the cylinders may be balanced on an upper lever which is. oscillated by the beam 34 or, as shown, directly by the link 33. This construction is adapted to secure accuracy. When a single cylinderis used. it may be actuated by a lever 34, one end being balanced by a weight, or the link 33 may be connected directly to the bearing 38, and is arranged above the disk 28. When it is desired to hold both cylinders off the forme without stopping the machine, the link 33, Fig. 8, is connected to a link 48, and the link 48 and lever 34 are slotted. A rod 45 fits in the two slots, and, according as the rod 45 is moved by an eccentric 51 to occupy an outward or inward position, the lever 34 is oscillated, or remains still, when the. disk 28 is rotated. When the cylinders are carried by a rocking beam, the cylinders are checked by means of an auxiliary lever actuated by an eccentric ; this, lever can be moved to engage a stop on the beam, or so as to cause the link 33 to engage and oscillate the beam ; the lever is connected by a link to the link 33.