Tanco Autowrap Technical information

Subject Cut and Start
Description Testing and adjusting the pressure
Modified 13-8-04
Location found on turntable type machines
Model 404 M/EH 280 580 1080
The Cut and start system is designed to ‘Cut’
the film at the end of the wrapping cycle and
‘Hold’ the film ready for the start of the next
bale
Setting and adjustment
The cut and start unit is a double acting
hydraulic cylinder, one side is connected to the hydraulic
valve assembly thro a rotary coupling underneath the
turntable, the other directly to an accumulator.
Pressured oil from the tractor forces the cylinder open
and pushes the oil from the opposite end of the cylinder
into the accumulator. The stored oil is use to close the
cylinder(open the cut & start) to release the film at the
start of the next wrapping cycle.
Tanco Autowrap
Technical information
Should the accumulator or hydraulic seals fail extreme caution should be
taken when servicing this unit due to stored pressure.
Charging the system
The unit can be charged with a hand pump as shown in the diagram or using
the oil supply line that normally closes the cut and start.
If the unit is overcharged or the tractor
hydraulic pressure is low the cylinder will
not completely open (cut the film).
If the unit is undercharged the cylinder will
not fully close (release the film).
The information contained in this document is for reference only.
Tanco Autowrap is not responsible for damage caused to machines due to incorrect adjustment.

Tanco
Cut and start
The purpose of the C & S(Cut & Start)is to enable an automatic
application of the film to the bale at the start of the wrapping cycle.
Then at the end of the cycle, the cutting of the film.
The C & S cycle is the same for all of the models, the only difference
being weather it happens automatically or manually as on the 580S.
The C & S on the turntable models use a stored pressure system which
uses an accumulator to open the unit. The 1300 & 1500 models use a
double acting cylinder.
On the 280/580/1080 models
After 2 revelations of the turntable, the oil pressure is diverted from
the C & S and returned to the tractor automatically, this releases the
held tail of the film. The cutter cylinder remains retracted for the
rest of the wrapping cycle.
After the preset number of turns has been reached the turntable slows
to half speed(on the automatic machines. On the manual models the
turntable will stop at the position as set by the operator on the
controller) normally with the cutter to the rear of the machine.
The automatic machine will position the turntable with the cutter
directly under the film. The manual model may require a small movement
of the control leaver.
Automatic model.
The 'tip button' on the controller is then pressed to unload the bale.
The turntable frame tips upward, and the film gathering arm lowers to
gather the film to a smaller area.
A sensor on the rear of the turntable sets the correct angle for
cutting the film. (some small adjustment is normally required for new
machines) Once the film is lying flat across the cutter bars the
cylinder is powered out to cut the film. The turntable continues
tipping to unload the bale. The Film is held ready for the start of the
next bale.
Manual model.
The control leaver is operated to tip the turntable, once the film is
lying flat across the cutter bars the button on the top of the control
leaver is pressed. This diverts the oil flow from the tipping cylinder
to the cutter. Once the film has been cut the button can be released
and the turntable continues tipping to unload the bale. The Film is
held ready for the start of the next bale.
On the 1300/1500 models
After 2 revelations of the rotating arm the cutters open for a preset
time set by the controller, this releases the tail of the film. The
cutter then closes to avoid damaging the film as the rotating arm will
soon return for the next pass of the bale.
After the number of rotations have been reached, the wrapping arm will
slow to half speed on the opposite side of the bale from the cutter.
The wrapping arm will continue to rotate slowly and the cutter will
open. The wrapping arm will stop when it reaches the sensor(depending
on any time settings in the controller), the cutter will then close to
complete the cycle. The Film is held ready for the start of the next
bale.