Roland Offsetmaschinenfabrik Faber & Schleicher Ag

Grapho Metronic Gmbh & Co.

Grapho Metronic Mess-und Regeltechnik Gmbh & Co.

Peter Decker

Burkhardt Wirz

Bert Cappel

Peter Mayer

Alfred Dorn

Valentin Gensheimer

An ink roller for a printing press having a cylindrical outer shell presenting a roller surface and having a control fluid-displacing core, a hollow cylindrical partition being interposed between the shell and the core to define inner and outer annular passageways connected in series having respective inlet and outlet openings. A source of cooling fluid is connected to the inlet opening so that a feed stream of cooling fluid flows longitudinally through the inner passage and turns around to form a cooling stream flowing in counterflow relation through the outer passage. The cylindrical partition is formed of conductive material so that heat absorbed at a given region of the roller surface by the cooling stream flows radially inwardly for absorption by the feed stream at substantially the same rate, so that the cooling stream has only minimum net gain or loss of heat; this tends to equalize the temperature along the length of the cooling stream and hence along the length of the roller surface. In the preferred embodiment of the invention the thermal conductivity of the cylindrical partition in the radial direction is so varied as a function of length that the rate of heat transfer radially through the partition from the cooling stream to the feed stream over each unit of length of the partition is substantially equal.

Water cooled ink roller for printing presses

A system for facilitating throw-off and re-engagement of a blanket cylinder with respect to cooperating plate and impression cylinders and which minimizes wastage of copies incident to reestablishing equilibrium in the inking and dampening systems following an interruption of the normal printing process. Two separate control means are provided for controlling the rate of water flow, the first being an automatic control at the water fountain and the second being in the form of means for controllably disengaging the water form roller from the printing plate. Means are provided for switching from the first control means to the second when the blanket is disengaged for promptly cutting off the flow and thereafter maintaining a water film of predetermined thickness on the plate. Simultaneously with disengagement of the blanket cylinder the ink feed rolls are declutched and the ink form rollers are disengaged for promptly cutting off flow of ink to the plate while preserving the film thickness gradient which exists in the ink feed system. A blanket cleaner is incorporated together with means for spraying solvent on the ink feed rolls. The throw-off mechanism is so arranged that, upon resumption of normal printing, the blanket is brought into engagement with the plate for a predetermined interval before it is engaged with the impression cylinder, thereby insuring that the blanket is re-inked to optimum degree before contact is made with the impression cylinder. As the blanket is brought into engagement with the plate, the inking system, with its pre-existing gradient, is reactivated and the control of water flow, after a delay interval, is restored to the water fountain, permitting the immediate printing of perfect copies.

Throw-off system for rotary offset printing press

Means for measuring and correctively changing the thickness of a film of water on the plate of an offset printing press which includes a light source forming a spot of light on the plate with light pick-up means including a photocell producing an output signal in response to remitted light. A disc carrying two filters in symmetrically spaced sectors is interposed in the path of the light reaching the photocell. The first filter is a band pass filter which passes a wavelength slightly separated from a maximum light absorption band of water. The second filter passes a wavelength which is well separated from the maximum light absorption band of water and which lies in a region of where there is minimum change of absorption as a function of film thickness. As a result the photocell is subjected to an alternating series of 'measuring' light pulses and 'reference' light pulses through the respective filters. Means are provided responsive to the pulsating output signal of the photocell to provide a direct indication of film thickness. In a preferred form of the invention a water fountain roller is driven at a variable speed, and a servo system is interposed between the photocell and the motor which drives the fountain roller for constant corrective variation in speed to maintain the film thickness automatically at a desired level.

Dampening system on an offset printing press with a device for

An inking system for applying ink to a printing plate which includes a fountain roller and a series of ink feed rollers with at least one vibrated roller or drum. Means are provided for automatically regulating the temperature of the fountain roller thereby to maintain constant the amount of ink fed over a long press run for maintenance of a predetermined full tone density. Means are also provided for automatically regulating the temperature of the vibrated roller thereby to maintain constant the printing contrast in the half tone portions of the plate. The temperature regulating means includes both a source of heat and a source of cold, making it possible to either warm or cool the rollers thereby permitting automatic operation over a wide range of conditions including a wide variation in the ambient temperature. In the preferred embodiment the temperature of the rollers is maintained by circulating a fluid such as water through the rollers from a reservoir of fluid at a controlled rate and temperature. Means are additionally provided for applying to the rollers a 'shot' of fluid which is selectively either hot or cold to bring the rollers rapidly to desired temperature prior to turning on the automatic regulating means. In one embodiment of the invention the temperatures of the fountain roller and vibrated roller are independently regulated by supplying them with fluid from separate reservoirs having provision for separate temperature regulation.

Growing community of inventors

Munich, Germany

Peter Decker