MLD-S Tech-FB Library Description - Bosch Rexroth

Rexroth MLD-S Tech-FB Library MLD-S Technology Library 1-43
Flow Wrapper
The following figure shows a sideseal axis (foil infeed axis) used by flow
wrapper applications.
Fig. 1-58:
Sideseal axis in a flow wrapper application
In this application products are fed into the packaging machine with an
infeed belt. The sideseal axis will infeed the foil in a corresponding
position to the product. The correct relationship between the foil and the
product with a reproducible product length is required.
Slippage between the material and the crimp rollers as well as
inaccuracies in the material can result in position errors between the
servomotor and the foil. Therefore registration marks are printed on the
material to correct for these position errors.
Prints, pictures and dirtiness on the product could result in noise signals
on the registration input. Therefore an expectation window for registration
signals is required. Only in the expectation window is the drive’s probe
function active to measure the registration mark position. It is also
necessary to detect missing marks in the expectation window.
The correction movement is proportional to the difference between the
measured and the setpoint value. It is required to limit the correction
movement to a user defined value because of mechanical limits.
The register controller has to adjust the sideseal axis to the printed foil in
order to align the foil to the product.
The sideseal axis operates in phase synchronization mode. The register
controller calculates an additive position command value of the sideseal
axis in order to align the foil.
The key settings of the probe function, register controller and drive
operation mode of this application are:
• Measured Value (Probe Function) = Resulting master axis position (P-
0-0775)
• Controlled Value (ControlledValueIDN) = Additive position command
value (S-0-0048 or P-0-0691)
• Drive operation mode = Phase synchronization
DOK-MLD-S*-TechFB*****-AW01-EN-D