(57) The invention relates to a machine with a hydraulically controlled counterpressure
element. The machine comprises a frame and top and lower machine parts (1, 2) in a
conventional way for performing the embossing. According to the invention the counterpressure
element (6, 11) is connected to a hydraulic cylinder (4, 12), said counterpressure
element engaging the plate (3). The hydraulic cylinder (4, 12) is connected to a hydraulic
circuit having a controllable hydraulic pressure, so that the counterpressure element
is pressed back at the controlled pressure during an embossing operation. The counterpressure
element may be included in a holding means to hold the plate securely during the embossing.
According to the invention a machine part (1) is then connected to a positive counterpressure
element (10) and another machine part (2) is connected to a hydraulic cylinder (4),
said hydraulic cylinder (4) having a plunger and a stem (5) connected to a gripping
means (6) holding the plate (3) together with the positive counterpressure element
(10), such that the plunger during an embossing operation is pressed back at a controlled
pressure. The holding means provides a secure holding through the whole press operation.
The counterpressure element may also be included in an embossing counterpressure element,
in which the counterpressure may be set in order to achieve a pre-embossing or a pressure
controlled embossing. The invention may be applied to all types of machines in which
counterpressure elements are required.
|
|
