Patent GB-191123891-A (GB)
Title: Improvements in and relating to Machine for Making Pulp Board.
Inventor: HENRY ALBION MOODY
IPC: D21F9/00
Filed: 1911-10-28
Abstract: 23,891. Moody, H. A. Oct. 29, 1910, [Convention date]. Void. [Published under Section 91 of the Act.] Cylinder paper-machines; slitting, cutting, and severing in paper-machines; cylinders and drums.-In a cylinder machine for making pulp board, the usual pulp vat is dispensed with, the pulp from a stock box 13, Fig. 2, flows on to the mould roll 6, and the moisture is drawn through the surface of the roll and caught in a pan 11, the pulp web being delivered to the couch roll 7, from which it is transferred to the forming- roll 8. The couch roll is mounted in fixed bearings, and the mould roll is held against it by hydraulic pressure, the bearings being connected to the upper movable parts 9, Fig. 3, of the air chambers, which are at the end of the roll and have flanges 9<c> working in annular hydraulic chambers 9<e>. The forming-roll is held against the couch roll by hydraulic pressure acting on the piston 25<a> attached to its bearings, the hydraulic cylinder being fixed to the frame. A valve 12, Fig. 2, cuts out the compartments of the mould at the point of contact with the couch roll, and thus enables the web to be transferred from one roll to the other. A valve 16 cuts out suction from a number of compartments in the couch roll and facilitates the transfer of the web to the forming-roll. When the board attains the desired thickness, it is cut off automatically by a cutter 21 mounted on a knife-carriage provided with dogs 22<i>, Fig. 6, which engage in a chain 22 running in a track in the periphery of the forming-roll. The chain is driven from a motor 23 through gearing 23<b>, 23<c>, and tightening-mechanism for the chain comprises bell-crank levers 22<d>, the lower ends of which are operated by a right- and-left threaded screw 22<e>, on which is mounted a hand-wheel at the end of the roll. Mechanism to start the motor when the board is of the desired thickness comprises a bracket fastened to the support for the bearings of the forming-roll and carrying a flange which has four electric connexions, two for the generator wires and two for the motor wires, the latter being connected to a pair of segmental contactpieces 28<c> fastened to the frame and contacted during each revolution of the forming-roll by fingers 28d. A ratchet-wheel 29, having four electric contact points 29<a> connected together in pairs, has eight teeth so arranged that by successive eighths of a revolution the electric circuit is completed in one direction, cut off, completed in the opposite direction, and cut off again. By this means, the cutter is traversed across the forming-roll first in one direction and then in the other. To operate the ratchetwheel, a spring-hinged finger 26<a> is attached to the shaft 8<b> of the forming-roll, and a cam 30<a> mounted on the rod 30 deflects the finger 26" and prevents it from striking the ratchet-wheel until the motion of the shaft 8<b>, owing to the thickening of the board on the roll, brings a slot 26d in the finger 26<a> opposite the cam 30<a>. The cam 30<a> then no longer deflects the finger, and the ratchet-wheel is rotated one-eighth of a revolution. The position of the cam can be adjusted according to the thickness of the board to be made. After the board is cut, it still remains between the couch roll and forming-cylinder for one revolution, and the finger strikes the ratchet-wheel a second time, thus cutting off the current and stopping the motor. The board is delivered by rolls 18 on to the apron 19.