Patent GB-404008-A (GB)
Title: Sizing machines
IPC: B41M7/02
Filed: 1932-07-01
Abstract: <PICT:0404008/III/1> <PICT:0404008/III/2> <PICT:0404008/III/3> A machine for applying a finishing coating of size to both sides of printed sheets of paper, such as banknotes, comprises a tank containing liquid size, a pair of endless absorbent travelling blankets, a guide for the lower reach of one blanket located within the tank, guiding and presser rollers for bringing a reach of each blanket into parallel and contacting relation to the other and for subjecting the parallel reaches to intermittent pressure to transfer size from the blanket passing through the tank to the other blanket, and mechanism for feeding the sheets in spaced relation to each other between the parallel reaches of the blankets.  Driving mechanism for travelling blankets.  The lower blanket 17 passes over guide and presser rollers 14, Fig. 2, and 16, Fig. 3, around a power-driven roller 21 at the delivery end of the machine, and under a roller 12 mounted adjacent to the lowest point of the tank 11 which is provided with inclined bottom walls 72.  The upper blanket 18 passes around guide and presser rollers 13, 15 co-operating with the rollers 14, 16 respectively and the parallel reaches of the blankets pass also between guide and presser rollers 19, 20, each pair of rollers 13 and 14, 15 and 16, 19 and 20, being provided with means for regulating the pressure between them.  The blanket 17 also passes around smaller rollers 22, 23 frictionally driven from the roller 21 and arranged to facilitate the transfer of the sized sheets to a delivery mechanism and the blanket 18 passes around similar small rollers arranged adjacent to the roller 15 to ensure that the sheets remain upon the blanket 17 at this point.  The rollers 13, 14 are mounted on a carriage 26 slidable upon the side bars of the main frame 10 by rotation of screws connected by chain and sprocket mechanism 29 and simultaneously actuated from a hand-wheel 30 for tightening both blankets.  The rollers 15, 16 are mounted on a carriage 31 slidable upon the frame 10 by co-operation with fixed screws of worm wheels mounted on the carriage 31 and actuated through a transverse worm shaft 36 for tightening the blanket 18. The roller 21 is driven through gearing 41, 42, 43 from a main power shaft and the rollers 16, 20 are driven by a sprocket chain 47 from a sprocket wheel 44 carried by the gear wheel 41 and engaging guide wheels 48--51 and 53--55.  The rollers 15 and 19 may be geared to the rollers 16, 20 respectively.  Automatic straightening mechanism of known type, comprising rollers 58, 59 and the usual attachments is provided for correcting any tendency of the blankets to run askew.  Feed and delivery mechanism for the printed sheets.  The sheets are fed by hand or automatically from a shelf 65 to an endless belt 62 passing around rollers 63, 64, the roller 63 being disposed adjacent to the line of contact of the rollers 13, 14 and the roller 64 being driven through a sprocket chain 66 from the shaft 52 of the guide wheel 51 at a speed such that the belt 62 travels more slowly than the blankets 17, 18.  The sheets leaving the blanket 17 adjacent to the roller 23 are transferred to a delivery belt 68 passing through a drying box and driven by a roller 69 and a sprocket mechanism 70 from the shaft of the gear wheel 42 at a speed higher than that of the blankets 17, 18.  Thermostatic control.  The tank 11 is provided with a water jacket 73 communicating through a partly flexible pipe 75 with an expansion and overflow tank and supplied with water at a suitable temperature through pipes 88, 89 from sources of hot and cold water respectively.  The water in the jacket is heated by steam from a nozzle 79, the supply of steam being controlled by a thermostat 84 located in the part of the tank 11 adjacent to the nozzle 79 and by a thermostat 85 located in the jacket 73, at a point remote from the nozzle 79.  For this purpose, the steam supply pipe 80, which is partly flexible, is provided with valve mechanism 81, Fig. 4, controlled by the pressure of air in a pipe 82 of which the supply valve 83 is controlled in known manner through flexible connections 86, 87 from the thermostats 84, 85 respectively, such valve 83 being adjustable for cutting off the steam supply at any desired temperature.  Alternatively one only of the thermostats 84, 85 may be employed.  Flushing and cleansing arrangements.  Upon completion of a run the tank 11 may be emptied through a valve-controlled pipe 113 the blankets flushed with water from a hose 94 connected to pipes 95, 96 supplying hot and cold water respectively, and the tank flushed with water from a pipe 112 connected to the pipes 95, 96.  The blankets may then be thoroughly cleaned by repeated passage through water in the tank.  To complete the cleaning of the tank, the latter which is provided with guide members 103, 104 slidable in fixed vertical guides 105, 106, may then be lowered by hand operation through gearing 107, 108, 109, 110 and a nut 99 upon a screwed rod 97 supporting the tank, a second screwed supporting rod 98 being fitted with a similar nut 100 driven from the nut 99 through a sprocket chain and gear connection 111.