Patent GB-526943-A (GB)
Title: Improvements in machines for the production of moulded bodies from suspensions of fibrous material
IPC: D21J3/00
Filed: 1938-12-20
Abstract: 526,943. Moulding pulp. WERNER, C. Dec. 20, 1938, No. 37005. Convention date, Dec. 22, 1937. [Class 87 (ii)] In a machine for the production of moulded bodies from fibrous material suspended in a liquid, such as water, of the kind comprising a mould having parts movable relatively to other parts and walls permeable to both gas and liquid, and having in association with the mould means, for effecting in succession, under individual and mutual time control, the steps of closing the mould parts, introducing the fibrous material under pressure into the mould, and re-opening the mould parts, the means for effecting at least some of these steps is pneumatically or vacuum operated through the intermediary of means comprising elements which are controlled by one or more of the mould parts during the opening and closing movements of these parts. The mould, Fig. 2, comprises two sides 42, a fixed top 44, and a bottom 46. The sides are mounted on perforated holders 48 within a cap 50 and are moved together and apart by rods 52 reciprocated by eccentrics 54 and cranks 56, Fig. 1, coupled by a rod 55 connected to a piston 60 operated by compressed air in a cylinder 58. The bottom 46 is carried by a holder 68 and is moved vertically by a piston 74 in a compressed-air cylinder 72. The fibrous suspension, pressure water, steam and hot air are supplied through the top 44 from a chamber 80 and conduits 82, 84, 86, 88 respectively. The supply is controlled by valves 83, 85, 87, 89 in the conduits operated by spindles, such as 90, working in separate compressed-air cylinders. The arrangement is such that the operations are automatically controlled from a series of valves 34 operated by cams 32 on a shaft 30. A main drive-shaft 10 drives a gear 16 mounted on one arm of a bellcrank lever 14 which can be moved to connect the gears 16, 28 so as to drive the shaft 30. The lever 14 is connected to a piston 22 working in a compressed-air cylinder 20. In operation, the bottom 46 is raised by the piston 74, compressed air being supplied through valves 124, 100 from a supply pipe 174. As the bottom reaches its upper position, an abutment 156 strikes a lever 168 to open a safety valve 160 and admit air to the cylinder 20 so as to throw the gears 16, 28 into engagement to operate the cams 32. One of the valves 34 then admits air to the cylinder 58 to close the mould sides 42. As the sides close, an abutment 110 on the rod 55 closes the valve 100 and cuts off supply to the cylinder 72. The bottom 46 is held engaged by a groove 80 in the sides which are held together by pressure maintained in the cylinder 58. Other valves 34 are successively moved to operate the pistons controlling the supply valves 89 .... A further valve 34 operates piston 60 to open the mould sides whereat an abutment 108 opens the valve 100 and air is supplied thence through a valve 120 to lower the piston 74 and the bottom 46 with the article thereon. The article is blown off by air supplied through an aperture 197 on operation of the valve 136 by the abutment 156.