Patent GB-189556-A (GB)
Title: Improvements in stereotype plate finishing and cooling machines
IPC: B41D1/00
Filed: 1921-09-02
Abstract: 189,556. Hoe & Co., Ltd., R., (Hoe & Co., R.). Sept. 2, 1921. Stereotype, cooling and finishing. In a stereotype-plate finishing and cooling machine of the kind in which the plate is held in a rotatable cylinder during the finishing and cooling operations, the cylinder driving means and a cylinder locking device are connected to a common manually actuated controlling shaft by which the cylinder is first unlocked and then connected to the driving gear. The cylinder is automatically stopped and locKed at the end of each half revolution, and is preferably driven by belt and fast and loose pulley gear. As shown, the cylinder 5 is driven from a motor shaft 32 by a belt 35 and shaft 28 carrying fast and loose pulleys 29, 30 and a pinion 27 meshing with a gear 26 on a shaft 25 carrying a pinion 24 engaging gear 23 fixed to the cylinder. A belt shifter 46 is secured to a controller shaft 39 provided with an operating handle 40 at each end and capable of both longitudinal and rotary movement. The belt-shifter 46 is operated automatically to stop the machine at the end of half a revolution of the cylinder 5 by either of two cams on the cylinder engaging a roller 48 on a lever pivoted at 50 and connected to a loose collar 53 on the shaft 39, the movement of the collar actuating the belt-shifter through a spring 55. If a complete revolution of the cylinder is desired, the shaft 39 may be held by the operator against movement, the spring 55 allowing the movement of the collar 53. The cylinder is locked when at rest by a block 45 on the cylinder engaging the end of the latch 43 connected by a link 42 to an arm 41 on the shaft 39, rotary movement of which acts to withdraw the latch against the action of a spring 44. To absorb the shock when the cylinder is stopped, the latch 43 is pivoted to a lever 430 controlled by a spring 43<1>. To prevent starting of the cylinder before it is unlocked, one of the handles 40 is provided with a pin 56 which abuts against a stop arm 57 on the machine frame to prevent the longitudinal] movement of the shaft 39 till it has been turned sufficiently to release the cylinder. The cylinder is adapted to carry two plates, and is provided with two ledges 7 against which one edge of each plate is yieldingly pressed by clamping tongues 9 engaging the other edges. The tongues 9 are carried by spring-pressed plates 8 slidable in circumferential grooves in the cylinder. Arranged adjacent to one side of the cylinder is a socket 15 which carries a spring pressed pin 16, and is secured to a rock shaft 20 operated by depressing either of two foot-levers 22. Just before the cylinder comes to rest, a projection 18 on the adjacent plate 8 snaps past the pin 16 and, when the cylinder stops, the shaft 20 is rocked to cause the pin 16 to bear against the projection 18 to unlock the upper plats which can then be removed from the cylinder to allow of the insertion of a new plate. The plates are cooled within the cylinder by water admitted through a pipe 590, a plate 59 secured to the knife bar 61 serving as a dam to prevent the water flowing out at one end of the cylinder. The tail of the plate is severed by a cutter 36 driven by a belt 38 from the shaft 32.