Patent GB-190018714-A (GB)
Title: Improvements in Rotary Lithographic Printing Machines.
Inventor: TUDOR EDWARD
Filed: 1900-10-19
Granted: 1901-08-24
Abstract: 18,714. Tudor, E., Grimshaw, H., and Furnival, R. B. Oct. 19. Lithographic and like printing. -Relates to rotary machines for printing from aluminium, zinc, or copper &c. plates, in which the plate cylinder revolves continuously and the impression cylinder stops to take the sheets. Fig. 1 shows an elevation of part of the machine from one side, and Fig. 2 a similar view from the other side. The plate cylinder A is driven by wheels C<1> and pinions c from the shaft C. The impression cylinder B is driven from the cylinder A by the gears C' and wheels b, b<1>, of which b is loose on the cylinder shaft D and the other b<1> is fast but has its teeth removed between the points b<2>, b<3>. The cylinder B is gradually started and brought into gear for each impression by a pawl g, pivoted on an arm G loose on the shaft D, and engaging a tooth d fixed on this shaft. The arm G is connected by a rod f with a lever F operated by a cam E on the shaft a of the cylinder A. On the inner side of the loose wheel b is pivoted pawl H, which engages the tooth or notch H<1> on the cylinder when the wheel b is driving the cylinder B. The pawl H is thrown out of gear at each revolution by a lever or bar h operated by a cam h<1> so that its upper end engages a runner h<2> on the pawl. The cylinder B is brought to rest by a brake K operated by a cam k &c. To ensure the cylinder B travelling to the same position at each revolution, a second cam M, Fig. 1, operates the lever F and pawl g. The cylinder is locked in its position of rest by a sliding or pivoted notched catch L engaging a stud L' on the brake-wheel. The catch L is withdrawn by a rod l<3> and cam l<2>each time the cylinder makes a revolution. The operator can prevent the rotation of the cylinder B, when desired, by operating a bar N having a crosshead N<1> which engages the pawl g and holds it out of engagement. The bar N reciprocates with the bar h, both bars engaging arms of a shaft n<1>. A pedal o operates, through a rod and lever o', a pivoted stop which engages a stud o<3> and holds the bar N in its raised position, whereby both pawls g and H are held out of operation. On the shaft n' is also an arm P connected by a rod p with a lever p<1> which operates an arm p<2> on the shaft of the grippers P<1>. The crosshead N<1> is prevented from coming into operation against the pawl g while the pawl is engaged with the tooth d by a lever R which engages a stud r and depresses the crosshead N on its pivot against the force of a spring r<1>. The lever R is operated by the cam R'. The inking-rollers S are driven from the shaft U independently of the plate cylinder A, so that the inking-apparatus may be run while the cylinder is at rest. The pinions c are loose on the shaft C, and are driven by clutches so that the cylinder A may be stopped, while the rollers S are driven. The clutch lever t<1> for starting the pinions c and cylinder A can only be actuated to start the cylinder at the proper times. This is effected by a lever W<1> operated by a cam W and provided with a catch which prevents the operation of the clutch lever except at the proper time.