Wexxar WF-10T, Operation And Service Manual

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WF-10T Case Former Machine Maintenance
9-94
9.9.4 Tape is Off-center
The line of tape is not centered over the gap between flaps on the bottom of the case.
Look for the following conditions:
•
Tape roll position.
Verify that the tape roll is fully pushed onto the spool.
•
Tape head straight.
Verify that the tape head sits straight in its bracket, and is not tilted
to either side.
•
Obstructions.
Look for obstructions that could be pushing the tape off-center.
9.9.5 Tape Falls Forward on Tape Head
The beginning end of the tape must stand vertically in front of the tape head front roller in order to
contact the leading end of the next case. A bow made across the tape by the tape head guides
helps to stiffen the tape, and a static electric charge on the tape head rollers attracts the tape and
helps to keep it in place.
If the tape will not stand vertically, examine the following factors:
•
Contamination.
The tape may be wound around the roller or there may be dirt on the
roller.
•
No static charge.
Dust the roller surfaces with talcum powder to increase the static
charge on the roller.
•
Tape head guides.
Verify that the tape holder, or finger, is set correctly. See tape head
manual.
•
Ambient conditions.
A strong breeze in the vicinity of the tape sealer can cause the
tape to blow down. High temperature or humidity may affect tape characteristics.
•
Type of tape.
Some brands and types of tape have more ‘body’ than others, and a
change of tape may be needed, particularly in difficult ambient conditions.
9.10
Repair Procedures
The operating time before significant wear will occur with WEXXAR packaging machines depends
upon the service duty to which the machine is subjected, and can vary widely between different
customers. Many wear points are quite simple (bushings, rod ends, etc.), and the corrective
action is self-evident. Some repair jobs requiring special attention are described in the following
paragraphs. Please also refer to the assembly drawings in the Supplementary Manual, which
contain much helpful information and all necessary part numbers.
9.10.1 Solenoid Valve Repairs
The valves are designed for easy replacement.
1) Lock the air
OFF
at the manual shutoff valve upstream of the filter-regulator unit.
2) Lock
OFF
the electrical power.
3) Remove the two screws that secure the valve body to the manifold block.
4) Replace the complete valve/solenoid assembly, taking care to properly install the gasket
to prevent leakage.
Overhaul of valve/solenoid assemblies can be undertaken, but this must be carried out in a clean
area. Clean the solenoid air pilot actuated assembly with clean mineral spirits if necessary.