Patent GB-191423944-A (GB)
Title: Improvements in or relating to Stereotype Plate Finishing and Cooling Machines.
IPC: B41D5/00
Filed: 1914-12-11
Granted: 1915-12-13
Abstract: 23,944. Goss Printing Press Co., [Goss Printing Press Co.]. Dec. 11. Printing-surfaces; stereotype. - Relates to stereotype-plate-finishing machines of the kind in which the plate is held in a rotatable drum during the time that the ribs of the plate are shaved and the tail of the plate out off and the ends trimmed, and consists chiefly in the provision of a plate stop which is moved into operative position by the movement of the plate prior to its entry into the drum, and freed from operative position by the locking of the plate in the drum, and in an improved construction of the means for withdrawing the finished plate from the drum. The plate 68, with the tail 70 attached, is pushed into the drum 21 on to side bars 46, 47 against a stop comprising lugs 62 on an arm 59 pivoted at its ends to a standard 58 and to a lever 64, which is provided with a head 66. The lugs 62 are normally held depressed clear of the plate by a spring 60 or by the weight of the parts, but are raised into plate-stopping position by the engagement of the plate with the head 66 and retained in that position by the tail 70 engaging the head 66 until the plate is locked in the drum, as described below, when the stop returns to its original position. The printing-plate is lifted from the bar 47 to lock it against the inner surface of the drum, by a lug 72 on a plate 71, Fig. 3, slidably mounted on the drum 21 and moved into plate-locking position by a spring 76 and held in platereleasing position by toggle-levers 78, 80. The toggle is operated to allow the spring 76 to lock the plate by an arm 82 on a hand-operated slidable bar 83. The toggle is moved in the opposite direction to release the plate by means of a cam 84 carried by a gear ring 22, loose upon the drum 21 and constantly rotated by gearing from the driving-shaft 30. The drum is rotated by means of a pawl 92 carried by the ring 22 and controlled in the manner described in Specification 21,027/14; but the sliding bar 86 carrying the roller 100, which holds the pawl-controlling lever 95 in the inoperative position, is separate from the sliding bar 83 and is slidably connected to it as shown in Fig. 7. The bar 86 is held in its advanced position by a latch 91 against the action of a returning-spring 90. If the bars 83, 86 are pushed in just after the pawl passes the notch 94 in the drum, but before the cam 84 has passed the toggle 78, 80, the sliding connexion between the bars 83, 86 allows the printing- plate to be unlocked and prevents damage to the machine. The finished plate is withdrawn from the drum into a cooling-device 36 by means of a gripper 126 carried by links 124, 125 pivoted to a plate 123 carried by a rack-bar 120 reciprocated by a gear-wheel 119 driven by a pinion 116 gearing with a segment 115 on a bell-crank 114 connected by an adjustable link 122 to a crank-disk 112 on a shaft 109 driven from the shaft 30. A spring 128 tends to hold the gripper raised clear of the plates. The gripper is depressed to engage the plate by means of a cam 133 on the gripper engaging a fixed block 134. During the withdrawal of a plate, the previous plate is pushed out of the cooling-device by a projection 136 on the gripper. The gripper is further depressed to release the plate by the engagement of the link 125 -with a fixed block 138, and when the link has moved past the block 138, the spring 128 raises the gripper to allow it to return freely. The gripper is prevented from withdrawing a plate which is loose in the drum but has not had its tail cut off, by means of an inclined plate 63 carried by the stop-lugs 62. Specifications 23,931/14 and 23,933/14 are also referred to.