This image shows clearly the two (yellow) hydraulic cylinders, used to set pressure to the top roller. These cylinders are interconnected to guarantee an even pressure on both sides of the press. The maximum force these cylinders can produce is 10.000 kgs. (22.000 lbs.) each. The total maximum downward force of the top roller is therefore 20.000 kgs. (44.000 lbs.)These cylinders are not intented as a tool to move the top roller vertically when this roller is not under pressure. The "normal" pressure spindles will take care of that. The top roller rests on heavy pressure springs. This means that the top roller will follow the movement of the pressure spindles, both up and downwards.The pressure in the hydraulic system, which indicates the downward force of the top roller, can be read on a gauge. This allows to use the same pressure in a future printing run easily.
The pressure spindles are fitted with two hexagon nuts. One of these nuts can be used to tighten it against the frame, resulting in fixation of the position of the pressure spindle. This is useful when the printer has found the correct position for the spindle and he wants to keep it there.The two nuts are intended to be secured against each other. If the printer has found the correct postion of the spindle, he will secure it with one nut against the frame. If he wants, "at the end of the day", to take the pressure off the press but, wants to continue printing the next day; he secures the second nut against the first one, before releasing the pressure spindle. The two nuts, will, if secured against eachother, move upwards with the spindle. The next day, the printer turns the spindles down again until the secured nuts block against the frame, and the top roller has again exactly the same position as the day before.
Also visible on this page are the adjustable feet. To avoid tensions in the frames, it is important to set the press level. In most cases the floor is not level, so the adjustable feet will be used to adjust the press. |
