DigiConvert Operating Instructions
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DigiConvert Operating Instructions
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11.3.
Punching station
The punching stations are used to punch the material as required.
The punching station consists of two or more cylinders that are pressed together. The gearbox
converts the motor revolutions into the slow revolutions of the cylinder axis, and permits exact position
control. The motor speed proper is controlled by an electronic axis. This permits absolute
synchronisation of punching station and running web to be maintained at any web speed.
A pneumatic cylinder opens and closes the punching cylinder.
11.3.1.
General Information About the Punching Station
The punch can be used in two different modes. These are "Fixed repeat length" and "Translative"
mode.
11.3.1.1.
Fixed Repeat Length
In "Fixed repeat length" mode, the repeat length is expected to start again on the material web, too,
after a punching cylinder revolution.
Consequently, the material web speed in the machine is the same as the surface speed of the punch.
In this mode, the translative module is not required. If the material web is controlled by the translative
module, movements of the translative compensation cause the register to change. To prevent this, the
system automatically activates translative compensation, which cannot be deactivated.
11.3.1.2.
Translative
In "Translative" mode, a punching sheet is installed on the magnetic cylinder that covers "only" a part
of the magnetic cylinder circumference.
The material web speed in the machine is thus different to the one in the area of the translative
module.
In this mode you need the translative module to implement the above-mentioned process. In this
mode, the material web must thus always be guided by the translative infeed, the punch, the
translative compensation, and the translative delivery.
The system automatically activates translative compensation, which cannot be deactivated.
To operate the machine, translative compensation must be in "Translative synchronous mode".
The material web must not slip over the translative infeed. This requires the pressure cylinder of the
translative infeed to be closed. The contact pressure must be correspondingly high. The web tension
difference across the translative infeed, i.e. the web tension before the translative infeed and the web
tension in the translative module, should not be too big. This would increase the risk that the web slips
over the translative infeed.