Heat exchange – With timer – programmer – time delay – or condition responsive... – Temperature responsive or control
Reexamination Certificate
1999-12-03
2001-09-18
Lazarus, Ira S. (Department: 3743)
Heat exchange
With timer, programmer, time delay, or condition responsive...
Temperature responsive or control
C165S108000, C165S221000, C165S206000
Reexamination Certificate
active
06289984
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a temperature-control apparatus for a printing machine according to the preamble of claim
1
.
A printing machine of this type is disclosed in DE-A-44 29 520. An injector is necessary for it to function, making the temperature-control apparatus correspondingly more expensive. Further temperature-control apparatus for printing machines are disclosed by DE-A-42 02 544 and DE-A-37 26 820. Heat loads or cold loads, which are at or provide temperatures to be controlled, are printing machine cylinders of a very wide range of types, and damping solution for wet offset printing. The temperature of the rolls or cylinders can be controlled by temperature-control liquid being led through them or by the temperature-control liquid being led through a heat exchanger, in which air which is blown by a blower onto the outer surface of the relevant cylinder or the corresponding roll which is thereby cooled.
SUMMARY OF THE INVENTION
The invention is intended to make the temperature-control apparatus of a printing machine inexpensive and enable the temperature of a load to be kept within extremely close tolerances.
According to the invention, this object is achieved by a temperature-control apparatus for a printing machine which comprises a closed, temperature-control fluid circuit including a pump with a suction and pressure side, a fluid feed line feeding temperature-controlled fluid from a fluid source to the suction side of the pump and a fluid return line between the pressure side of the pump and the load. Temperature-control fluid from the source is pumped by the pump through the fluid circuit to the load and is recycled to the suction side of the pump. A valve is connected between the pressure side of the pump and a return line to the source and is controlled by a temperature sensor that senses the temperature in the circuit and selectively directs fluid from the source through the circuit or out of the circuit and back to the source dependent upon the sensed temperature in the circuit. There may be a heater in the circuit.
A flow resistance is located in the temperature-control fluid circuit between the connection points of the fluid feed line and the fluid return line for creating a back pressure in the circuit and aiding the passage of fluid through or out of the circuit through the valve.
The invention is used in particular for cooling parts of a printing machine which, without such cooling, would reach temperature values, which lie above the temperature needed for an optimum printing operation. However, the invention is also suitable for heating parts of printing machines, as long as they still have not reached their optimum operating temperature during a machine start-up phase.
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Baldwin Grafotec GmbH
Ciric Ljiljana V.
Lazarus Ira S.
Ostrolenk Faber Gerb & Soffen, LLP
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